I'm sure Im probably reiterating some people's points here, but since I just got done watching the special...
I dont know what people expected out of this special, particularly because after all, it was MTV. And its not E3. All MS wanted to do was create some chatter. It was splashed on the front pages of MSNBC, and maybe the other major news sites as well. They're not gonna tell all, mainly because the casual gamer doesnt get it (specs and whatnot), and also because if MS dropped too many bombs, they wouldnt have anything to say at E3. If anything, this was a teaser. If it turns out that MS has nothing else to say at E3, thats when it becomes a disappointment.
As for what I saw, I liked it, but not to the point that ill buy at launch. Im pretty disappointed that the DVR rumor was false, but to be honest, tacking DVR to this thing might send the price upwards of 500 bucks. Once E3 comes around, Ill have a better idea, depending on what Sony and Nintendo show.