I'm both semi-disappointed, and vaguely hoping for a DLC pack, or ten, to fill in some of the obvious cars they've missed, its not too bad, I found 21 cars I genuinely want to drive in the game.
Acura NSX Concept (NA3) 2012
BMW M5 (F10) (was present at the Silverstone GT6 reveal)
BMW Z8 E52 2001
Audi TT RS typ 8J (was present at the Silverstone GT6 reveal)
Ferrari Dino 246 GT 1971
Fisker Karma EcoSport 2012
Ford Focus ST Mk. III 2013
Honda NSX Concept (NA3) 2012
http://www.youtube.com/watch?v=Wy_i52yH00s
Hyundai Veloster Turbo 2012 (spotted being photographed by PD at Cobb Tuning in California)
Hyundai Genesis Coupe 3.8 2012 (either the Track or R-spec package)
Jaguar XKR-S (X150) 2012
KTM X-Bow R 2012
KTM X-Bow GT 2013 (was present at the Silverstone GT6 reveal)
Light Car Company Rocket 2007
Mercedes Benz A45 AMG (W176) 2013
Mercedes Benz E63 AMG AWD (W213) 2013
Pagani Huayra 2011
Peugeot Unnamed Concept 2013
Renault Sport Megane Trophy V6 2011
Shelby Cobra Daytona Coupe 1964
Toyota Corolla Levin (AE86) (was present at the Silverstone GT6 reveal)
Volkswagen Golf GTI Vision Gran Turismo 2013