I think most people would definitely call me a grognard (although I lack a beard, at present -- hah

). I think separating the system from the "D&D" label is a useful thing. I have no interest at all in 4E, as far as it being my "new D&D." 4E (and even 3E, for that matter) don't seem like D&D, to me, and 4E won't be a replacement/upgrade/new D&D, for me. However, I still think 4E has some interesting features, design-wise. It's a
different approach that caters to a different kind of game from the old editions. I don't see myself ever running a 4E game, but I'd happily play in one, now and then -- it may not seem like D&D to me (and I stress the "to me" part, here -- if it feels like D&D to you, I have no argument with you), but it looks like it's a well-designed system that's probably fun to play, regardless.