i doubt it. it's a real shame, but these days, 8 months is pretty old for a smartphone. htc has released at least a half dozen devices on verious networks since it released the thunderbolt. you never know though.
Possible but unlikely especially since it's a US carrier branded device. The UK Desire HD with similar hardware just got Sense 3.0 but wouldn't hold my breath for it to make it to the Thunderbolt (at least no officially anyways).