The T-Mobile version of the Galaxy SII (S2) is receiving an update today, either via OTA or Samsung Kies, that keeps the device on Android 4.0.4 but brings a few needed fixes. The update, which can bring you to baseband version T989UVLI1 or T989UVLH1, is just 11MB when downloaded OTA and has a few fixes on board. Apparently a Qualcomm fix is included, along with other security enhancements and Vlingo S Voice improvements.
When first seeing that an update was available for the Galaxy S2 we instantly jumped to conclusions, thinking that this may be the Jelly Bean update. The update started rolling out for the international S2 yesterday, but unfortunately T-Mobile's model is on ICS for just a while longer. Have you received the update via OTA or Kies? Head to the forums and chime in, as some users are already reporting seeing the update arrive on their devices.