This includes the extension release notes for Chrome 17.

chrome/common/extensions/docs/static/whats_new.html

 <div id="pageData-name" class="pageData">What's New in Extensions?</div>
 <!-- <div id="pageData-showTOC" class="pageData">true</div> -->
 
 <p>
 This page lists the API and manifest changes
 made in recent releases.
 </p>
 
 <ul>
+  <li> <a href="#17">Google Chrome 17</a> </li>
   <li> <a href="#16">Google Chrome 16</a> </li>
   <li> <a href="#15">Google Chrome 15</a> </li>
   <li> <a href="#14">Google Chrome 14</a> </li>
   <li> <a href="#13">Google Chrome 13</a> </li>
   <li> <a href="#12">Google Chrome 12</a> </li>
   <li> <a href="#11">Google Chrome 11</a> </li>
   <li> <a href="#10">Google Chrome 10</a> </li>
   <li> <a href="#9">Google Chrome 9</a> </li>
   <li> <a href="#8">Google Chrome 8</a> </li>
   <li> <a href="#7">Google Chrome 7</a> </li>
   <li> <a href="#6">Google Chrome 6</a> </li>
 </ul>
 
 <p>
 In addition to the changes listed below,
 check out the
 <a href="experimental.html">experimental APIs</a>.
 </p>
 
+<h2 id="17"> Google Chrome 17 </h2>
+
+<h4> New APIs </h4>
+  <ul>
+    <li> The
+      <a href="webRequest.html">web request API</a>
+      lets you intercept, block, or
+      modify requests in-flight and
+      to observe and analyze traffic.
+      </li>
+  </ul>
+
+<h4> Manifest changes </h4>
+  <ul>
+    <li>
+      Permissions can be
+      <a href="permissions.html">optional</a>
+      for the content setting API, the web navigation API, and
+      the new web request API.
+  </ul>
+
+<h4> Additions to existing APIs </h4>
+  <ul>
+    <li>The management API's
+    <a href="management.html#type-ExtensionInfo">ExtensionInfo</a> object
+    now has a <code>disabledReason</code> property.
+    </li>
+  </ul>
+
+<h4> Changes to existing APIs </h4>
+
+  <ul>
+    <li>The <a href="omnibox.html">omnibox API</a>
+    now works in
+    <a href="manifest.html#incognito">split incognito mode</a>.
+    </li>
+  </ul>
+
 <h2 id="16"> Google Chrome 16 </h2>
 
 <h4> New APIs </h4>
   <ul>
     <li> The
       <a href="webNavigation.html">web navigation API</a>
       lets extensions receive notifications about the status
       of navigation requests.
       You can use this API to track navigation events.
     </li>
@@ skipping 415 matching lines @@
   <ul>
     <li>The <a href="manifest.html#geolocation">geolocation</a> permission
       gives an extension access to the user's physical location. </li>
     <li><a href="match_patterns.html">Match patterns</a> can now select all
       schemes or all URLs. </li>
     <li>Access to file:/// URLs no longer triggers the "access to your machine"
       security warning, but now requires user opt-in from the extensions
       management page. </li>
   </ul>