I haven't seen anything about it. but i think it would be cool if you could replace individual parts without the car being completely fixed. example if you brake a suspension component. im just thinking for making movies in game.so you dont have the old dukes of hazzard fixed car after a jump lol.
I hope (and think) this will be added when the campaign mode comes out. This way, you will be able to buy an old broken car and fix 'er up. Or when you crash, go to the scrapyard and buy some parts.