His take on it, as somebody who's not a WotC employee directly but is contractually bound by a nondisclosure agreement, is that the released materials are leading to very skewed perceptions about what 4E is like, and while he can see why people are coming to the various conclusions they're coming to, they're not accurate and he wishes he could say all the things necessary to counteract the perceptions people have, but that his contract basically forbids it.
I can sympathize with this a bit, having been under NDAs myself once or twice (although usually I didn't have any juicy stuff worth disclosing); and Keith has a reputation for being a pretty stand-up guy who communicates well with the fandom. That, combined with the fact that WotC marketing seems to be consistently screwed up, leaves me inclined to take him at his word on the topic. That doesn't mean I'm now a 4E convert, but it does make me a little more willing to actually pick up the thing and read it when it finally comes out.
I also gave him a standing invitation to come do some HERO gaming whenever he's in D.C., as he has relatives in the area. So maybe we'll see him at the table sometime.