Index: wp-admin/about.php
===================================================================
--- wp-admin/about.php	(revision 31035)
+++ wp-admin/about.php	(working copy)
@@ -38,13 +38,15 @@
 		<?php _e( 'Credits' ); ?>
 	</a><a href="freedoms.php" class="nav-tab">
 		<?php _e( 'Freedoms' ); ?>
+	</a><a href="contribute.php" class="nav-tab">
+		<?php _e( 'Contribute' ); ?>
 	</a>
 </h2>
 
 <div class="changelog headline-feature">
 	<h2><?php _e( 'Introducing Twenty&nbsp;Fifteen' ); ?></h2>
 	<div class="featured-image">
-		<img src="//s.w.org/images/core/4.1/theme.png" />
+		<img src="//s.w.org/images/core/4.1/theme.png?0" />
 	</div>
 
 	<div class="feature-section">
@@ -55,7 +57,7 @@
 			 <p><?php _e( 'Your content always takes center stage, whether viewed on a phone, tablet, laptop, or desktop computer.' ); ?></p>
 		</div>
 		<div class="col">
-			<img class="" src="//s.w.org/images/core/4.1/mobile.png" />
+			<img class="" src="//s.w.org/images/core/4.1/mobile.png?0" />
 		</div>
 	</div>
 
@@ -68,10 +70,10 @@
 	<h2><?php _e( 'Distraction-free writing' ); ?></h2>
 	<div class="feature-section">
 		<div class="dfw-container">
-			<img src="//s.w.org/images/core/4.1/focus.png" class="base-image" />
-			<img src="//s.w.org/images/core/4.1/focus1.png" class="overlay-image fade-in" />
-			<img src="//s.w.org/images/core/4.1/focus2.png" class="overlay-image fade-in" />
-			<img src="//s.w.org/images/core/4.1/focus3.png" class="overlay-image from-left" />
+			<img src="//s.w.org/images/core/4.1/focus.png?0" class="base-image" />
+			<img src="//s.w.org/images/core/4.1/focus1.png?0" class="overlay-image fade-in" />
+			<img src="//s.w.org/images/core/4.1/focus2.png?0" class="overlay-image fade-in" />
+			<img src="//s.w.org/images/core/4.1/focus3.png?0" class="overlay-image from-left" />
 		</div>
 		<h3><em><?php _e( 'Just write.' ); ?></em></h3>
 		<p><?php _e( 'Sometimes, you just need to concentrate on putting your thoughts into words. Try turning on <strong>distraction-free writing mode</strong>. When you start typing, all the distractions will fade away, letting you focus solely on your writing. All your editing tools instantly return when you need them.' ); ?></p>
Index: wp-admin/contribute.php
===================================================================
--- wp-admin/contribute.php	(revision 0)
+++ wp-admin/contribute.php	(working copy)
@@ -0,0 +1,51 @@
+<?php
+/**
+ * Contribute administration panel.
+ *
+ * @package WordPress
+ * @subpackage Administration
+ */
+
+/** WordPress Administration Bootstrap */
+require_once( dirname( __FILE__ ) . '/admin.php' );
+
+$title = __( 'Contribute' );
+
+list( $display_version ) = explode( '-', $wp_version );
+
+include( ABSPATH . 'wp-admin/admin-header.php' );
+?>
+<div class="wrap about-wrap">
+
+	<h1><?php printf( __( 'Welcome to WordPress %s' ), $display_version ); ?></h1>
+
+	<div class="about-text"><?php printf( __( 'Thank you for updating! WordPress %s helps you focus on your writing, and the new default theme lets you show it off in style.' ), $display_version ); ?></div>
+
+	<div class="wp-badge"><?php printf( __( 'Version %s' ), $display_version ); ?></div>
+
+	<h2 class="nav-tab-wrapper">
+		<a href="about.php" class="nav-tab">
+			<?php _e( 'What&#8217;s New' ); ?>
+		</a><a href="credits.php" class="nav-tab">
+			<?php _e( 'Credits' ); ?>
+		</a><a href="freedoms.php" class="nav-tab">
+			<?php _e( 'Freedoms' ); ?>
+		</a><a href="contribute.php" class="nav-tab nav-tab-active">
+			<?php _e( 'Contribute' ); ?>
+		</a>
+	</h2>
+
+	<p class="about-description"><?php printf( __( 'WordPress is Free and open source software, built and maintained by community of mostly volunteers from around the world. Whether you are a budding developer, a pixel-perfect designer, or just like helping others use WordPress, <a href="%s">there are many different ways for you to get involved with WordPress</a>.' ), 'https://make.wordpress.org/' ); ?></p>
+
+	<p>Here are some of the many ways to get involved in our community:</p>
+
+	<ol>
+		<li><p><?php printf( __( 'Join the <a href="%1s" title="WordPress Docs Team" target="_blank">Docs Team</a> that maintains the <a href="%2s" title="WordPress Codex" target="_blank">Codex</a>, handbooks, <a href="%3s" title="WordPress Developer Resources" target="_blank">developer.wordpress.org</a>, <a href="%4s" title="WordPress Admin Help" target="_blank">admin help</a> and <a href="%5s" title="WordPress Inline Docs Project" target="_blank">inline docs</a>.' ), 'https://make.wordpress.org/docs/', 'http://codex.wordpress.org/', 'https://developer.wordpress.org/', 'https://make.wordpress.org/docs/tag/admin-help/' ,'https://make.wordpress.org/docs/tag/inline-docs/' ); ?></p></li>
+		<li><p><?php printf( __( 'Help out others in the <a href="%s" title="WordPress.org Support Forums" target="_blank">Official WordPress Support Forums</a>.' ), 'https://wordpress.org/support/' ); ?></p></li>
+		<li><p><?php printf( __( 'Join the <a href="%s" title="WordPress Accessibility Group" target="_blank">WordPress accessibility group</a>, a team dedicated to improving accessibility in core WordPress and related projects.'), 'https://make.wordpress.org/accessibility/' ); ?> </p></li>
+		<li><p><?php printf( __( 'Join the <a href="%s" title="WordPress Theme Review Team" target="_blank">WordPress Theme Review Team</a> a group of volunteers who review and approve themes submitted to be included in the official WordPress Theme directory.' ), 'https://make.wordpress.org/themes/' ); ?></p></li>
+
+	</ol>
+
+</div>
+<?php include( ABSPATH . 'wp-admin/admin-footer.php' ); ?>
Index: wp-admin/credits.php
===================================================================
--- wp-admin/credits.php	(revision 31035)
+++ wp-admin/credits.php	(working copy)
@@ -93,6 +93,8 @@
 		<?php _e( 'Credits' ); ?>
 	</a><a href="freedoms.php" class="nav-tab">
 		<?php _e( 'Freedoms' ); ?>
+	</a><a href="contribute.php" class="nav-tab">
+		<?php _e( 'Contribute' ); ?>
 	</a>
 </h2>
 
Index: wp-admin/freedoms.php
===================================================================
--- wp-admin/freedoms.php	(revision 31035)
+++ wp-admin/freedoms.php	(working copy)
@@ -30,6 +30,8 @@
 		<?php _e( 'Credits' ); ?>
 	</a><a href="freedoms.php" class="nav-tab nav-tab-active">
 		<?php _e( 'Freedoms' ); ?>
+	</a><a href="contribute.php" class="nav-tab">
+		<?php _e( 'Contribute' ); ?>
 	</a>
 </h2>