The Stable channel has been updated to 28.0.1500.68 for all Chrome OS devices (Platform version: 4100.68.0 for all devices except Cr-48, which was updated to 4100.78.0). This build contains a number of feature enhancements, bug fixes and security improvements. Machines will be receiving updates over the next several days.

Release Highlights:

Numerous crash fixes and performance improvements.
Speed improvements for the Files app, along with support for files that are Shared with me and Recent on Google Drive.
Monitor Rotation and Scaling - you can scale your UI smaller and rotate the screen on all Chromebooks.
Notification pop-up message appears when screenshots are taken. Clicking on the notification will bring you right to the screenshot.
Replaced the Japanese IME with a NaCl extension version downloads a better language model upon actual usage.
Added transliteration IMEs for Indic languages from Google Input Tools.
Touch link highlighting on Chromebook Pixel - we now provide feedback on which link you click or button you press.
Updated Chrome Office Viewer (Beta) extension
Pepper Flash updated to 11.8.800.94
More at the Chrome Release Blog