The Beta channel has been updated to 28.0.1500.53 (Platform version: 4100.48.0 for most platforms, 4100.49.0 for Lenovo Thinkpad) for all Chrome OS devices. This build contains a number of bug fixes, security updates and feature enhancements.
Some highlights of these changes are:
- Pepper Flash updated to 11.8.800.68-r5
- File app fixes/improvements
- Stability fixes
-  Medium CVE-2013-2866: Clickjacking in the Flash plug-in.
- Video frames may get delayed when playing videos in normal mode. Workaround: Play videos in Full screen