It will most likely not get any Sense updates.
Sense 3.0 is very demanding and a 1ghz processor wont run it very smoothly. As well, it'll kill your battery quickly. The only phones running 3.0 without being rooted have 1.2ghz duel core processors.
My Evo was rooted with 3.0 and I had to take it off because it got too annoying with the slowness. :-(