The $10 credit is still available, but the box that usually has it listed near the top has been replaced with the Black Friday stuff. Scrolling down, you can see the credit is still being offered.
I'm getting a $10 credit with my pre-order I put in months ago. Looks like it's gone now.
@Greg The pre-order car is the Mercedes-Benz SLS AMG Stealth. It' also not showing up in the game listing page but shows up as a banner ad on the Video Games title page now and again. The CE also has 5 exclusive cars but it looks like Amazon is sold out of their expected shipment. There's probably something in the PS3 SDK causing all this.