Maybe someone will have the same question later.
So if you found your answer, you could post it anyway
To make it a short one - It's simple:
Sorry for german pic - Didn't find a english one in this quality.
So the content for the Limited Edition will be ... :
1. The 2013 Ford Shelby GT500
2. Exclusive optical parts
3. Exclusive performance parts
4. Exclusive sticker (Most likely the Winner of the "Style your Car"-Contest)
5. 10k Crewcredits
Thats all ^^
I don't think it would be a good idea to bind the difference to the countrys. That way the gamers may be forced to buy the game from another location to get there dreamcar - Maybe it could be impossible at all.
Most games give different pre order bonuses for different shops, so for example Amazon will give one car, Uplay another, Steam a third one. That gives a greats chance for everyone to pick there favorite car.
Or there will be only this one - Thats possible, too ^^