The full list of updates in the new Chrome OS build — there are a lot of them:
* 3G modem activation fixes
* 3G connection to the carrier fixes
* Wi-Fi connectivity/Out of the Box fixes
* New trackpad and sensitivity setting adjusted
* Auto update engine and debugging improvements
* Power optimizations
* GTalk video/chat optimizations
* Audio CPU utilization improvements
* Improved on screen indicators: brightness, network status, update icon
There’s also a scratchpad application security vulnerability fix included in this release. Technically this is version 0.10.156.46 of Chrome OS.
Source: TechCrunch