I own 40Ds and a 5D2, and yeah, I'm angry that Canon didn't put this autofocus arrangement into the $2700 camera where it belongs. It'd take a minor miracle for the 7D to have better high-iso capability than the 5D2, which is what I need the 5D2 for. The difference is, the 7D will be able to focus in low light (with all the AF points, not just the center) while the 5D2 is a bad joke in that regard.
There was no excuse for this omission. If Canon can put 19-point cross-sensor AF in a $1700 body, they sure as heck could have put something a whole lot better than the lame 9-point, one cross-type AF in the $2700 body a very short time ago.