diff --git a/wp-admin/about.php b/wp-admin/about.php
index 7b1c78c01d..ec17ef3132 100644
--- a/wp-admin/about.php
+++ b/wp-admin/about.php
@@ -67,7 +67,12 @@ include( ABSPATH . 'wp-admin/admin-header.php' );
 		</div>
 
 		<div class="full-width">
-			<img src="https://wordpress.org/gutenberg/files/2018/11/Gutenberg-copy-2.jpg" alt="">
+			<picture>
+				<source type="image/webp" media="(max-width: 782px)" srcset="https://s.w.org/images/core/5.0/header/Gutenberg%20Mobile1x.webp 1x, https://s.w.org/images/core/5.0/header/Gutenberg%20Mobile.webp 2x" />
+				<source media="(max-width: 782px)" srcset="https://s.w.org/images/core/5.0/header/Gutenberg%20Mobile1x.jpg 1x, https://s.w.org/images/core/5.0/header/Gutenberg%20Mobile.jpg 2x" />
+				<source type="image/webp" srcset="https://s.w.org/images/core/5.0/header/Gutenberg1x.webp 1x, https://s.w.org/images/core/5.0/header/Gutenberg.webp 2x" />
+				<img src="https://s.w.org/images/core/5.0/header/Gutenberg1x.jpg" srcset="https://s.w.org/images/core/5.0/header/Gutenberg1x.jpg 1x, https://s.w.org/images/core/5.0/header/Gutenberg.jpg 2x" alt="">
+			</picture>
 		</div>
 
 		<div class="feature-section one-col">
@@ -79,25 +84,37 @@ include( ABSPATH . 'wp-admin/admin-header.php' );
 		<div class="feature-section four-col">
 			<div class="col">
 				<figure>
-					<img src="https://wordpress.org/gutenberg/files/2018/11/Plugins-copy.jpg" alt=""/>
+					<picture>
+						<source type="image/webp" srcset="https://s.w.org/images/core/5.0/features/Plugins1x.webp 1x, https://s.w.org/images/core/5.0/features/Plugins.webp 2x">
+						<img src="https://s.w.org/images/core/5.0/features/Plugins1x.jpg" srcset="https://s.w.org/images/core/5.0/features/Plugins1x.jpg 1x, https://s.w.org/images/core/5.0/features/Plugins.jpg 2x" alt="" width="250" height="250" />
+					</picture>
 					<figcaption><?php _e( 'Do more with fewer plugins.' ); ?></figcaption>
 				</figure>
 			</div>
 			<div class="col">
 				<figure>
-					<img src="https://wordpress.org/gutenberg/files/2018/11/Layout.jpg" alt=""/>
+					<picture>
+						<source type="image/webp" srcset="https://s.w.org/images/core/5.0/features/Layout1x.webp 1x, https://s.w.org/images/core/5.0/features/Layout.webp 2x">
+						<img src="https://s.w.org/images/core/5.0/features/Layout1x.jpg" srcset="https://s.w.org/images/core/5.0/features/Layout1x.jpg 1x, https://s.w.org/images/core/5.0/features/Layout.jpg 2x" alt="" width="250" height="250" />
+					</picture>
 					<figcaption><?php _e( 'Create modern, multimedia-heavy layouts.' ); ?></figcaption>
 				</figure>
 			</div>
 			<div class="col">
 				<figure>
-					<img src="https://wordpress.org/gutenberg/files/2018/11/Responsive.jpg" alt=""/>
+					<picture>
+						<source type="image/webp" srcset="https://s.w.org/images/core/5.0/features/Responsive1x.webp 1x, https://s.w.org/images/core/5.0/features/Responsive.webp 2x">
+						<img src="https://s.w.org/images/core/5.0/features/Responsive1x.jpg" srcset="https://s.w.org/images/core/5.0/features/Responsive1x.jpg 1x, https://s.w.org/images/core/5.0/features/Responsive.jpg 2x" alt="" width="250" height="250" />
+					</picture>
 					<figcaption><?php _e( 'Work across all screen sizes and devices.' ); ?></figcaption>
 				</figure>
 			</div>
 			<div class="col">
 				<figure>
-					<img src="https://wordpress.org/gutenberg/files/2018/11/Editor-Styles-copy.jpg" alt=""/>
+					<picture>
+						<source type="image/webp" srcset="https://s.w.org/images/core/5.0/features/Editor%20Styles1x.webp 1x, https://s.w.org/images/core/5.0/features/Editor%20Styles.webp 2x">
+						<img src="https://s.w.org/images/core/5.0/features/Editor%20Styles1x.jpg" srcset="https://s.w.org/images/core/5.0/features/Editor%20Styles1x.jpg 1x, https://s.w.org/images/core/5.0/features/Editor%20Styles.jpg 2x" alt="" width="250" height="250" />
+					</picture>
 					<figcaption><?php _e( 'Trust that your editor looks like your website.' ); ?></figcaption>
 				</figure>
 			</div>
@@ -119,97 +136,145 @@ include( ABSPATH . 'wp-admin/admin-header.php' );
 		<div class="feature-section eight-col">
 			<div class="col">
 				<figure>
-					<img src="https://wordpress.org/gutenberg/files/2018/11/Block-Icon-Paragraph.jpg" alt=""/>
+					<picture>
+						<source type="image/webp" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Paragraph@1x.webp 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Paragraph.webp 2x" />
+						<img src="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Paragraph@1x.jpg" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Paragraph@1x.jpg 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Paragraph.jpg 2x" alt=""/>
+					</picture>
 					<figcaption><?php _e( 'Paragraph' ); ?></figcaption>
 				</figure>
 			</div>
 			<div class="col">
 				<figure>
-					<img src="https://wordpress.org/gutenberg/files/2018/11/Block-Icon-Heading.jpg" alt=""/>
+					<picture>
+						<source type="image/webp" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Heading@1x.webp 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Heading.webp 2x" />
+						<img src="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Heading@1x.jpg" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Heading@1x.jpg 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Heading.jpg 2x" alt=""/>
+					</picture>
 					<figcaption><?php _e( 'Heading' ); ?></figcaption>
 				</figure>
 			</div>
 			<div class="col">
 				<figure>
-					<img src="https://wordpress.org/gutenberg/files/2018/11/Block-Icon-Preformatted.jpg" alt=""/>
+					<picture>
+						<source type="image/webp" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Preformatted@1x.webp 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Preformatted.webp 2x" />
+						<img src="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Preformatted@1x.jpg" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Preformatted@1x.jpg 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Preformatted.jpg 2x" alt=""/>
+					</picture>
 					<figcaption><?php _e( 'Preformatted' ); ?></figcaption>
 				</figure>
 			</div>
 			<div class="col">
 				<figure>
-					<img src="https://wordpress.org/gutenberg/files/2018/11/Block-Icon-Quote.jpg" alt=""/>
+					<picture>
+						<source type="image/webp" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Quote@1x.webp 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Quote.webp 2x" />
+						<img src="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Quote@1x.jpg" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Quote@1x.jpg 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Quote.jpg 2x" alt=""/>
+					</picture>
 					<figcaption><?php _e( 'Quote' ); ?></figcaption>
 				</figure>
 			</div>
 			<div class="col">
 				<figure>
-					<img src="https://wordpress.org/gutenberg/files/2018/11/Block-Icon-Image.jpg" alt=""/>
+					<picture>
+						<source type="image/webp" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Image@1x.webp 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Image.webp 2x" />
+						<img src="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Image@1x.jpg" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Image@1x.jpg 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Image.jpg 2x" alt=""/>
+					</picture>
 					<figcaption><?php _e( 'Image' ); ?></figcaption>
 				</figure>
 			</div>
 			<div class="col">
 				<figure>
-					<img src="https://wordpress.org/gutenberg/files/2018/11/Block-Icon-Gallery.jpg" alt=""/>
+					<picture>
+						<source type="image/webp" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Gallery@1x.webp 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Gallery.webp 2x" />
+						<img src="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Gallery@1x.jpg" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Gallery@1x.jpg 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Gallery.jpg 2x" alt=""/>
+					</picture>
 					<figcaption><?php _e( 'Gallery' ); ?></figcaption>
 				</figure>
 			</div>
 			<div class="col">
 				<figure>
-					<img src="https://wordpress.org/gutenberg/files/2018/11/Block-Icon-Cover-Image.jpg" alt=""/>
+					<picture>
+						<source type="image/webp" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Cover%20Image@1x.webp 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Cover%20Image.webp 2x" />
+						<img src="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Cover%20Image@1x.jpg" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Cover%20Image@1x.jpg 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Cover%20Image.jpg 2x" alt=""/>
+					</picture>
 					<figcaption><?php _e( 'Cover' ); ?></figcaption>
 				</figure>
 			</div>
 			<div class="col">
 				<figure>
-					<img src="https://wordpress.org/gutenberg/files/2018/11/Block-Icon-Video.jpg" alt=""/>
+					<picture>
+						<source type="image/webp" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Video@1x.webp 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Video.webp 2x" />
+						<img src="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Video@1x.jpg" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Video@1x.jpg 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Video.jpg 2x" alt=""/>
+					</picture>
 					<figcaption><?php _e( 'Video' ); ?></figcaption>
 				</figure>
 			</div>
 			<div class="col">
 				<figure>
-					<img src="https://wordpress.org/gutenberg/files/2018/11/Block-Icon-Audio.jpg" alt=""/>
+					<picture>
+						<source type="image/webp" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Audio@1x.webp 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Audio.webp 2x" />
+						<img src="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Audio@1x.jpg" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Audio@1x.jpg 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Audio.jpg 2x" alt=""/>
+					</picture>
 					<figcaption><?php _e( 'Audio' ); ?></figcaption>
 				</figure>
 			</div>
 			<div class="col">
 				<figure>
-					<img src="https://wordpress.org/gutenberg/files/2018/11/Block-Icon-Column.jpg" alt=""/>
+					<picture>
+						<source type="image/webp" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Column@1x.webp 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Column.webp 2x" />
+						<img src="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Column@1x.jpg" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Column@1x.jpg 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Column.jpg 2x" alt=""/>
+					</picture>
 					<figcaption><?php _e( 'Columns' ); ?></figcaption>
 				</figure>
 			</div>
 			<div class="col">
 				<figure>
-					<img src="https://wordpress.org/gutenberg/files/2018/11/Block-Icon-File.jpg" alt=""/>
+					<picture>
+						<source type="image/webp" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20File@1x.webp 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20File.webp 2x" />
+						<img src="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20File@1x.jpg" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20File@1x.jpg 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20File.jpg 2x" alt=""/>
+					</picture>
 					<figcaption><?php _e( 'File' ); ?></figcaption>
 				</figure>
 			</div>
 			<div class="col">
 				<figure>
-					<img src="https://wordpress.org/gutenberg/files/2018/11/Block-Icon-Code.jpg" alt=""/>
+					<picture>
+						<source type="image/webp" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Code@1x.webp 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Code.webp 2x" />
+						<img src="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Code@1x.jpg" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Code@1x.jpg 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Code.jpg 2x" alt=""/>
+					</picture>
 					<figcaption><?php _e( 'Code' ); ?></figcaption>
 				</figure>
 			</div>
 			<div class="col">
 				<figure>
-					<img src="https://wordpress.org/gutenberg/files/2018/11/Block-Icon-List.jpg" alt=""/>
+					<picture>
+						<source type="image/webp" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20List@1x.webp 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20List.webp 2x" />
+						<img src="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20List@1x.jpg" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20List@1x.jpg 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20List.jpg 2x" alt=""/>
+					</picture>
 					<figcaption><?php _e( 'List' ); ?></figcaption>
 				</figure>
 			</div>
 			<div class="col">
 				<figure>
-					<img src="https://wordpress.org/gutenberg/files/2018/11/Block-Icon-Button.jpg" alt=""/>
+					<picture>
+						<source type="image/webp" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Button@1x.webp 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Button.webp 2x" />
+						<img src="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Button@1x.jpg" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Button@1x.jpg 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Button.jpg 2x" alt=""/>
+					</picture>
 					<figcaption><?php _e( 'Button' ); ?></figcaption>
 				</figure>
 			</div>
 			<div class="col">
 				<figure>
-					<img src="https://wordpress.org/gutenberg/files/2018/11/Block-Icon-Embeds.jpg" alt=""/>
+					<picture>
+						<source type="image/webp" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Embeds@1x.webp 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Embeds.webp 2x" />
+						<img src="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Embeds@1x.jpg" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Embeds@1x.jpg 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20Embeds.jpg 2x" alt=""/>
+					</picture>
 					<figcaption><?php _e( 'Embeds' ); ?></figcaption>
 				</figure>
 			</div>
 			<div class="col">
 				<figure>
-					<img src="https://wordpress.org/gutenberg/files/2018/11/Block-Icon-More.jpg" alt=""/>
+					<picture>
+						<source type="image/webp" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20More@1x.webp 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20More.webp 2x" />
+						<img src="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20More@1x.jpg" srcset="https://s.w.org/images/core/5.0/blocks/Block%20Icon%20More@1x.jpg 1x, https://s.w.org/images/core/5.0/blocks/Block%20Icon%20More.jpg 2x" alt=""/>
+					</picture>
 					<figcaption><?php _e( 'More' ); ?></figcaption>
 				</figure>
 			</div>
@@ -246,7 +311,13 @@ include( ABSPATH . 'wp-admin/admin-header.php' );
 
 		<div class="full-width">
 			<figure>
-				<img src="https://wordpress.org/gutenberg/files/2018/11/twenty-nineteen-copy.jpg" alt="">
+				<picture>
+					<source type="image/webp" media="(max-width: 782px)" srcset="https://s.w.org/images/core/5.0/twenty%20nineteen/twenty-nineteen-mobile@1x.webp 1x, https://s.w.org/images/core/5.0/twenty%20nineteen/twenty-nineteen-mobile.webp 2x" />
+					<source media="(max-width: 782px)" srcset="https://s.w.org/images/core/5.0/twenty%20nineteen/twenty-nineteen-mobile@1x.jpg 1x, https://s.w.org/images/core/5.0/twenty%20nineteen/twenty-nineteen-mobile.jpg 2x" />
+					<source type="image/webp" srcset="https://s.w.org/images/core/5.0/twenty%20nineteen/twenty-nineteen@1x.webp 1x, https://s.w.org/images/core/5.0/twenty%20nineteen/twenty-nineteen.webp 2x" />
+					<img src="https://s.w.org/images/core/5.0/twenty%20nineteen/twenty-nineteen@1x.jpg" srcset="https://s.w.org/images/core/5.0/twenty%20nineteen/twenty-nineteen@1x.jpg 1x, https://s.w.org/images/core/5.0/header/twenty-nineteen.jpg 2x" alt="">
+				</picture>
+
 				<figcaption><?php _e( 'The front-end of Twenty Nineteen on the left, and how it looks in the editor on the right.' ); ?></figcaption>
 			</figure>
 		</div>
@@ -259,17 +330,23 @@ include( ABSPATH . 'wp-admin/admin-header.php' );
 
 		<div class="feature-section three-col">
 			<div class="col">
-				<img src="https://wordpress.org/gutenberg/files/2018/11/twenty-nineteen-gutenberg.png" alt="">
+				<picture>
+					<source type="image/webp" srcset="https://s.w.org/images/core/5.0/twenty%20nineteen/block%20editor@1x.webp 1x, https://s.w.org/images/core/5.0/twenty%20nineteen/block%20editor.webp 2x" />
+					<img src="https://s.w.org/images/core/5.0/twenty%20nineteen/block%20editor@1x.jpg" srcset="https://s.w.org/images/core/5.0/twenty%20nineteen/block%20editor@1x.jpg 1x, https://s.w.org/images/core/5.0/twenty%20nineteen/block%20editor.jpg 2x" alt="">
+				</picture>
 				<h3><?php _e( 'Designed for the block editor' ); ?></h3>
 				<p><?php _e( 'Twenty Nineteen features custom styles for the blocks available by default in 5.0. It makes extensive use of editor styles throughout the theme. That way, what you create in your content editor is what you see on the front of your site.' ); ?></p>
 			</div>
 			<div class="col">
-				<img src="https://wordpress.org/gutenberg/files/2018/11/typography-copy.jpg" alt="">
+				<picture>
+					<source type="image/webp" srcset="https://s.w.org/images/core/5.0/twenty%20nineteen/typography@1x.webp 1x, https://s.w.org/images/core/5.0/twenty%20nineteen/typography.webp 2x" />
+					<img src="https://s.w.org/images/core/5.0/twenty%20nineteen/typography@1x.jpg" srcset="https://s.w.org/images/core/5.0/twenty%20nineteen/typography@1x.jpg 1x, https://s.w.org/images/core/5.0/twenty%20nineteen/typography.jpg 2x" alt="">
+				</picture>
 				<h3><?php _e( 'Simple, type-driven layout' ); ?></h3>
 				<p><?php _e( 'Featuring ample whitespace, and modern sans-serif headlines paired with classic serif body text, Twenty Nineteen is built to be beautiful on the go. It uses system fonts to increase loading speed. No more long waits on slow networks!' ); ?></p>
 			</div>
 			<div class="col">
-				<img src="https://wordpress.org/gutenberg/files/2018/11/three-3seconds.gif" alt="">
+				<img src="https://s.w.org/images/core/5.0/twenty%20nineteen/twenty-nineteen-versatile.gif" alt="">
 				<h3><?php _e( 'Versatile design for all sites' ); ?></h3>
 				<p><?php _e( 'Twenty Nineteen is designed to work for a wide variety of use cases. Whether you’re running a photo blog, launching a new business, or supporting a non-profit, Twenty Nineteen is flexible enough to fit your needs.' ); ?></p>
 			</div>
@@ -293,17 +370,26 @@ include( ABSPATH . 'wp-admin/admin-header.php' );
 
 		<div class="under-the-hood feature-section three-col">
 			<div class="col">
-				<img src="https://wordpress.org/gutenberg/files/2018/11/Protect-copy.jpg" alt=""/>
+				<picture>
+					<source type="image/webp" srcset="https://s.w.org/images/core/5.0/devs/Protect1x.webp 1x, https://s.w.org/images/core/5.0/devs/Protect.webp 2x" />
+					<img src="https://s.w.org/images/core/5.0/devs/Protect1x.jpg" srcset="https://s.w.org/images/core/5.0/devs/Protect1x.jpg 1x, https://s.w.org/images/core/5.0/devs/Protect.jpg 2x" alt="">
+				</picture>
 				<h3><?php _e( 'Protect' ); ?></h3>
 				<p><?php _e( 'Blocks provide a comfortable way for users to change content directly, while also ensuring the content structure cannot be easily disturbed by accidental code edits. This allows the developer to control the output, building polished and semantic markup that is preserved through edits and not easily broken.' ); ?></p>
 			</div>
 			<div class="col">
-				<img src="https://wordpress.org/gutenberg/files/2018/11/Compose-copy.jpg" alt=""/>
+				<picture>
+					<source type="image/webp" srcset="https://s.w.org/images/core/5.0/devs/Compose1x.webp 1x, https://s.w.org/images/core/5.0/devs/Compose.webp 2x" />
+					<img src="https://s.w.org/images/core/5.0/devs/Compose1x.jpg" srcset="https://s.w.org/images/core/5.0/devs/Compose1x.jpg 1x, https://s.w.org/images/core/5.0/devs/Compose.jpg 2x" alt="">
+				</picture>
 				<h3><?php _e( 'Compose' ); ?></h3>
 				<p><?php _e( 'Take advantage of a wide collection of APIs and interface components to easily create blocks with intuitive controls for your clients. Utilizing these components not only speeds up development work but also provide a more consistent, usable, and accessible interface to all users.' ); ?></p>
 			</div>
 			<div class="col">
-				<img src="https://wordpress.org/gutenberg/files/2018/11/Create-copy.jpg" alt=""/>
+				<picture>
+					<source type="image/webp" srcset="https://s.w.org/images/core/5.0/devs/Create1x.webp 1x, https://s.w.org/images/core/5.0/devs/Create.webp 2x" />
+					<img src="https://s.w.org/images/core/5.0/devs/Create1x.jpg" srcset="https://s.w.org/images/core/5.0/devs/Create1x.jpg 1x, https://s.w.org/images/core/5.0/devs/Create.jpg 2x" alt="">
+				</picture>
 				<h3><?php _e( 'Create' ); ?></h3>
 				<p><?php _e( 'The new block paradigm opens up a path of exploration and imagination when it comes to solving user needs. With the unified block insertion flow, it&#8217;s easier for your clients and customers to find and use blocks for all types of content. Developers can focus on executing their vision and providing rich editing experiences, rather than fussing with difficult APIs.' ); ?></p>
 			</div>
@@ -325,7 +411,12 @@ include( ABSPATH . 'wp-admin/admin-header.php' );
 			</div>
 
 			<div class="full-width">
-				<img src="https://wordpress.org/gutenberg/files/2018/11/Classic-2.png" alt="">
+				<picture>
+					<source type="image/webp" media="(max-width: 782px)" srcset="https://s.w.org/images/core/5.0/classic/Classic%20Mobile1x.webp 1x, https://s.w.org/images/core/5.0/classic/Classic%20Mobile.webp 2x" />
+					<source media="(max-width: 782px)" srcset="https://s.w.org/images/core/5.0/classic/Classic%20Mobile1x.jpg 1x, https://s.w.org/images/core/5.0/classic/Classic%20Mobile.jpg 2x" />
+					<source type="image/webp" srcset="https://s.w.org/images/core/5.0/classic/Classic@1x.webp 1x, https://s.w.org/images/core/5.0/classic/Classic.webp 2x" />
+					<img src="https://s.w.org/images/core/5.0/classic/Classic@1x.jpg" srcset="https://s.w.org/images/core/5.0/classic/Classic@1x.jpg 1x, https://s.w.org/images/core/5.0/header/Classic.jpg 2x" alt="">
+				</picture>
 			</div>
 
 			<div class="feature-section one-col">
diff --git a/wp-admin/css/about-rtl.css b/wp-admin/css/about-rtl.css
index 4f3ea46f0e..af9ee69801 100644
--- a/wp-admin/css/about-rtl.css
+++ b/wp-admin/css/about-rtl.css
@@ -46,7 +46,7 @@
 
 .about-wrap img {
 	margin: 0;
-	max-width: 100%;
+	width: 100%;
 	height: auto;
 	vertical-align: middle;
 }
@@ -584,7 +584,7 @@
 		margin-bottom: 1.5em;
 		width: 100%;
 	}
-	
+
 	.about-wrap .feature-section .col {
 		margin-top: 1em;
 	}
@@ -594,7 +594,7 @@
 	.about-wrap .three-col .col {
 		min-width: 100% !important;
 	}
-	
+
 	.about-wrap .eight-col .col {
 		min-width: 48% !important;
 	}
@@ -611,7 +611,7 @@
 	.about-wrap .under-the-hood:nth-of-type(3n) {
 		margin-top: 0;
 	}
-	
+
 	.about-wrap .under-the-hood img + h3 {
 		margin-top: 1.25em;
 	}
diff --git a/wp-admin/css/about-rtl.min.css b/wp-admin/css/about-rtl.min.css
index bd18c72626..4daf6e699b 100644
--- a/wp-admin/css/about-rtl.min.css
+++ b/wp-admin/css/about-rtl.min.css
@@ -1,2 +1,2 @@
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diff --git a/wp-admin/css/about.css b/wp-admin/css/about.css
index fec5bb396b..7b20cbce4f 100644
--- a/wp-admin/css/about.css
+++ b/wp-admin/css/about.css
@@ -46,7 +46,7 @@
 
 .about-wrap img {
 	margin: 0;
-	max-width: 100%;
+	width: 100%;
 	height: auto;
 	vertical-align: middle;
 }
@@ -584,7 +584,7 @@
 		margin-bottom: 1.5em;
 		width: 100%;
 	}
-	
+
 	.about-wrap .feature-section .col {
 		margin-top: 1em;
 	}
@@ -594,7 +594,7 @@
 	.about-wrap .three-col .col {
 		min-width: 100% !important;
 	}
-	
+
 	.about-wrap .eight-col .col {
 		min-width: 48% !important;
 	}
@@ -611,7 +611,7 @@
 	.about-wrap .under-the-hood:nth-of-type(3n) {
 		margin-top: 0;
 	}
-	
+
 	.about-wrap .under-the-hood img + h3 {
 		margin-top: 1.25em;
 	}
diff --git a/wp-admin/css/about.min.css b/wp-admin/css/about.min.css
index bf938f857d..2e946e8dda 100644
--- a/wp-admin/css/about.min.css
+++ b/wp-admin/css/about.min.css
@@ -1,2 +1,2 @@
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\ No newline at end of file
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 1d833f4421..3145cad11b 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-RC3-43967';
+$wp_version = '5.0-RC3-43968';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.