A couple of weeks ago Verizon released the Gingerbread update for the HTC Thunderbolt and then quickly and mysteriously yanked it back. Apparently, there were some last minute bugs that they needed to work out, and they have done so. The new support .pdf was just released and it details the 2.11.605.5 update. It doesn't specifically mention what was "fixed", but it obviously heralds the impending release of the newest GB update.
Source: ThunderboltForums via Thunderbolt_Gingerbread_2.11.605.5_update.pdf