Need for Speed Undercover Car List
From NFSUnlimited.net Need for Speed Wiki
The following cars have been viewed in the Need for Speed Undercover Teaser Trailer [1] Note that these cars have not been officially anounced by EA.
2009 Nissan GT-R R35 2007 Mitsubishi Lancer Evolution X 1998 Toyota Supra 2007 Porsche 997 Turbo 2004 Aston Martin DB9 2009 Lexus IS-F 2005 BMW E63 M6 2007 Lamborghini Murcielago LP640 2008 Audi RS5 2002 Dodge Viper GTS [2]
You can find the full list + Pictures here: [3]