On the official Need for Speed website there is a feature article about Aston Martin DBR9's appearance in Need for Speed SHIFT. It comes with 3 amazing screenshots of the car in game, so be sure to check it out.
If someone actually looked at the early screenshot of Shift which had the Corvette, the one that showed its cockpit cam, the one given when Shift was announced, both the 'Vettes looked the same, this could mean that they will have the Corvette C6R also