Update: The OTA is rolling out now, according to T-Mobile support. Changelog:
- Google Videos - A new Videos app has been added that allows you to buy and rent movies.
- Recent apps list expanded - The recent apps list has been expanded to show all apps recently used. After opening the apps list, touch one of the apps to access it.
- Home screen resizable widgets - Widgets built-in to Android 3.0 (Calendar, Email, Gmail, etc.)