Ability to skin cars anyway you wish, based on simple Jpeg.
Online updating of cars/models.
Car trading with online friends (can't wait for GT PSP)
And what that other guy said about driving anywhere in America based on Google Maps images. That would be so fucking awesome. I could drive to my friends house in the game and we could drive around the city. That would be great for mapquest, you could actually drive the route you have to take beforehand.









