I'm surprised I haven't seen more talk about San Andreas on here lately. About two weeks ago, GameSpot and IGN released features on the game. It appears they got the info for their features from the same meeting with game execs. I also stumbled across this site, which (if believable) has a lot of cool info about the game. Grr, 10/26 will never get here.
I rented it yesterday and played it for about eight straight hours with some friends of mine, getting to the fourth Act out of five, and I can definitely say that this is just as fun as the first one, if not even better.