1st:Project Gotham Racing 3
PGR3 is coming for the Xbox 360 and 1 look at this video should show how much the game will change with driver animations and beautiful lighting effects.

Car List:
McLaren F1 LM
TVR Segaris
Saleen S7
Ferrari F430
Lamborghini Murcielago

Tracks:
New York City

PGR3

Saleen S7

Early Box Art

2nd: Test Drive Unlimited
Test Drive Unlimited looks astonishing!!!
The last one was ok, but this one could change everything. With the Murcielago Roadster making its 1st appearence and the presence of a Hawaii track, this looks great!

Test Drive Unlimited
Video: Pierre-Anaud Lambert Video Interview

Cars:
~Lamborghini Murcielago Roadster
~Ford GT
~Aston Martin AMV8
~Mercedes-Benz SL55 AMG (SL55AMG?)
~Mercedes-Benz (CL55 AMG?)
~Lotus
~Mercedes-Benz SLR
~Dodge Viper SRT-10

Tracks:
~Hawaii Track
~Possible L.A. track

NEW INFO!
Ok, so it seems that you'll be able to either rent, tune and buy a car. Many new elements are going to be in this, and according to the makers, they are going back to the original concept.

I"ll be sure to update this info as much as possible. I am so siked!