For now T-Mobile announced Gingerbread 2.3.3, which will be a limited pilot for the update starting July 20. The update will extend in the coming weeks for the myTouch 4G customers and will continue through the end of the year.
T-Mobile specified if some customers wont recieve the update in the next days since this release roll out, they wont push the update even if this will be requested.
Update enhancements and improvements:
- New features:
- 2010 Exchange compatibility
- New version of Swype
- Android 2.3 (Gingerbread) OS
- Improved issues:
- Bluetooth® audio works better when answering a call from phone and Bluetooth is paired
- Display is more stable and responsive during boot up or use
- Domestic roaming data connection is more stable
- Message inbox saves
- Various software and stability improvements
source: T-Mobile Support