Not sure if it's been mentioned but make sure you download the extra map from the extras menu.
There are 2 - one under "Exclusive Content" (and it's STREETS wooo, exclusive

The other is under Comcast Map or something. Enter "Comcast Faster" in the redeem code to unlock. It's already on the disk, so I don't really see the point but hey.
Oh I know - without the Comcast sponsership it would no doubt have been a paid dlc. So fair enough I guess.