Robert Scoble makes it clear that until there are more Longhorn bits to play with, he'll be keeping his knob in check.  Which may be a relief to some.

"As for myself, yeah, I've seen Longhorn and, yeah, I'm very excited to be working at Microsoft because of it (and other things). But, I'm going to keep my own personal hype knob down at one until you have bits. I hear that'll be soon, but I'd rather wait until then."