The Stable channel has been updated to 21.0.1183.0 (Platform version: 2465.127.0) for Chromebooks (Acer AC700, Samsung Series 5 550, Samsung Series 5, and Cr-48) and Samsung Chromebox Series 3. Machines will be receiving updates to this version over the next several days.
This build contains a number of new features, as well as security & stability improvements.
Some highlights of these changes are:
We re-designed the App list to work alongside your browser and apps
New Print UI - please see the blog post for more details
You can select your own custom wallpaper
New, offline-capable Google Docs app
Update Adobe Flash to version 188.8.131.52
Flash Access Support
Seccomp Flash sandbox
New Shill connection manager
WiMax support in Shill
LTE Support for modem manager
Support Standard USB audio devices
Support wireless (bluetooth and others) Gamepads
Update GTalk Plug-In to version 3.3.3
Update Netflix Plug-in to version 2.0.5
Kernel rebased to 3.4
Gestures: support 3-finger tap/click as middle button
Resolved issues Samsung users were experiencing with Verizon Wireless activation
Security fixes and rewards:
Please see the Chromium security page for more detail. Note that the referenced bugs may be kept private until a majority of our users are up to date with the fix.
[$3133.7]  Critical CVE-2012-2864: Mesa array overflow. Credit to miaubiz.
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