GameStop Retail car

It looks like Burnout Paradise, much like Revenge for the 360, will feature downloadable retail cars. The screenshots were found on GameStop's product page for Burnout Paradise Xbox 360 version. It is unknown yet whether the cars will have to be downloaded through the Xbox 360 kiosks in store or if you will be able to download them over XBox Live.

Steel Wheels

As a further promotion to get people to pre-order the game, EA have also said that there will be a pre-order exclusive car, Steel Wheels, which can be obtained via an email code or a card from Gamestop when you pre-order.
I have added a few more images of the retail car to the Unofficial Screenshot Section. Feel free to check it out.

Source: GamingBits.com