Any time I've ever preordered a game from Amazon, I don't usually get a ship notice til Sunday. So I wouldn't start worrying just yet.
I preordered mine via GameStop's site, rather than Amazon since they were out of stock. I'm not sure what is going to happen with my order. But last email I got was them telling me they'd be authorizing my payment on the 4th. But nothing's come out of my account yet.