Looks awesome. Maybe a little disappointed by the 1.2GHz CPU, but it's more than twice as fast as my Hero, with a whole extra core and a GB of memory to play with, so I don't expect it'll be sluggish (especially running vanilla Android). Not at all dissapointed by a 5MP camera -- 8 would be the same resolution as my SLR, on a sensor probably 1/8 of the size. I imagine 5MP will give much better quality pictures, and a much more responsive camera app (which for a 'oh shit, look at that' picture which 99% of cameraphone ones are, is exactly what you want).
Not sure if it'll be on T-Mobile though. May be looking at a network swap. Much joy.