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 R35 Prototype Skyline 2007 Mitsubishi Evolution X 1998 Toyota Supra 2007 Porsche 997 Turbo 2004 Aston Martin DB9 2005 Lexus IS350 2005 BMW E63 M6 2007 Lamborghini Murcielago LP640 2008 Audi RS5
You can find the full list + Pictures here: [2]