They've officially revealed most of the cars in Hot Wheels Unleashed! The Party Wagon from TMNT, the Back to the Future DeLorean, KITT from Knight Rider, Snoopy's Doghouse from Peanuts, and a Batmobile that I'm not familiar with are among the roster
I'll compile a list and put it in the thread I made for the game, but it won't be until Sunday. At the bottom it says "more to come" so obviously the DLC then if there's any secret ones like in most hot wheels games