Its incredible how many people here voted for RUFs, I think we should get someone to destroy EA so we can just have real porsches, the day I can drive a Cayman R in a real racing game will be a fond day indeed.
Mostly the Veyron, yes it was old when the game was released, but it is still the pinnacle of automotive speed, perhaps especially the Super Sport (release that as DLC in a new car park, that'd be a good seller).
Otherwise more Euro and non-japan, non-usa cars to premium might be nice, but just adding more to the game in other ways could more preferable.
Also, should we get all of these cars free? Or as DLC to turn their 'premium' counter parts on?