Yes, one of the trashcan MacPros =)
From the reviews I've read, most are recommending updating to 10, since it does represent a definite improvement over 7 and 8 in many respects, but waiting to do so for a few months while MS works-out all the bugs people are finding. (Some suggest that the staged rollout is not only for logistic purposes, but so that MS could roll it out to the geeky crowd first and essentially post-beta test things before releasing it to the madding crowds).
Obviously as regards BootCamp, much depends on Apple and how it rolls-out drivers. My guess is that it'll wait until things become a bit more stable on MS's side of things. So we probably won't see a revised BootCamp for a few months. (I think support for 8 took, what, six months or something?)
Anyways, fun to play with, since I don't do any mission-critical stuff in windows on this machine =)