revise Develop landing page banner for Studio 2.2

Change-Id: I7eec3b72d09b87a56dfebd5391f9eac55dc26853

docs/html/develop/index.jd

@@ -15,20 +15,25 @@ excludeFromSuggestions=true
     <div class="cols dac-hero-content">
       <div class="col-1of2 col-push-1of2 dac-hero-figure">
         <img class="dac-hero-image" style="padding-top:32px"
-          src="/images/develop/hero-layout-editor_2x.png">
+          src="/images/develop/hero-layout-editor_2x.png"
+          srcset="/images/develop/hero-layout-editor_2x.png 2x,
+                  /images/develop/hero-layout-editor.png 1x">
       </div>
       <div class="col-1of2 col-pull-1of2" style="margin-bottom:40px">
         <h1 class="dac-hero-title">
             <a style="color:inherit" href="{@docRoot}studio/index.html">
-            Android Studio 2.2 <nobr>is here!</nobr></a></h1>
+            Android Studio 2.2!</a></h1>
 
-<p class="dac-hero-description">The latest version of Android Studio includes a
-rewritten layout editor with the new constraint layout, helping you build rich
-UI with less work. </p>
+<p class="dac-hero-description">There are 20+ new features in this release
+focused on helping you code faster and smarter. With Android Studio 2.2 you
+can:</p>
 
-<p class="dac-hero-description">
-There are 20+ new features in Android Studio 2.2, helping you code faster
-and smarter.</p>
+<ul class="dac-hero-description">
+  <li>Develop your app user interface faster with the new Layout Editor &amp;
+    Constraint Layout</li>
+  <li>Develop smarter with the APK analyzer &amp; expanded code analysis</li>
+  <li>Develop with the the latest Android 7.0 Nougat APIs &amp; features</li>
+</ul>
 
 <p style="margin-top:24px">
     <a class="dac-hero-cta" href="{@docRoot}studio/index.html">