Galaxy Nexus Update Change-log:

Device features
Optimized Mobile Hotspot when used with VPN.
Optimized 3G/4G data sessions for faster response times.
Fixed an incorrect notification that “data was disconnected due to roaming”.
Wi-Fi now automatically reconnects when returning to a known Access Point.
Improvements to special visual effects feature when using front-facing camcorder.
Visual improvements to the lock screen.
Email & messaging
Fixed an issue where some email attachments would not open correctly.
Apps & Widgets
DivX support has been removed, and will be supported in a future upgrade.
Improved audio volume in Google navigation turn-by-turn directions.