Well... We're as disappointed as everyone else who tried to find AH in stores today. We spent all afternoon driving to various stores looking for AH, and none of them had it. Like other users observed, EB has it scheduled for Monday the 22nd. Gamestop said it is active in their system, so they expected to have it today - but I don't think they did.
So basically, it looks like the game didn't ship on the 16th, and none of us were notified. Yeah, I'm very bummed out right now. I'm sick of not being able to give fans a solid release date, and I feel especially bad about fans who took time out of their day to go hunting for the game, only to come to the same conclusion we did.
However, AH WILL HIT SHELVES, dammit! Nothing can stop that now. Some users said it was out in their areas - if anyone actually sees it on a store shelf this week, please let me know! I'm as confused as you guys are right now... I'm dying to see it on the shelves. Sorry again to everyone who went looking for it and couldn't find it. I'll post more updates when I know something.