T-Mobile just updated its support page for the Samsung Galaxy S II with details of an OTA update that should be rolling out right now. Before you get your hopes up, though, there's some bad news: it's not ICS. It's just an incremental Gingerbread update that brings a handful of enhancements and improvements:

Android version 2.3.6 / Software version T989UVLDE

  • Version
    • Android version 2.3.6 / Software version T989UVLDE
    • Over-The-Air Update (32.3 MB)
    • Approved 5/21/12
  • Improvements:
    • Random reboot/power off fixed 
    • Device stability improvements 
    • Qualcomm chip patch 
    • Google Security fixes
  • Prerequisites
    • Android version 2.3.6 / Software version T989UVKL1 update
    • At least 50% battery life

The update should be available right now and will complete its rollout on June 22. To see if the update is available on your device, head into Settings > Software Update.

Update 5/23: T-Mobile posted the following update regarding OTA and Kies availability:

The software update will be available OTA and Kies after May 23. The update will  continue until June 22.

[T-Mobile]