According to CarKeys (http://www.carkeys.co.uk/news/2008/february/27/14756.asp):
The World Car award itself will be decided from a shortlist consisting of the Audi A5, Audi R8, Cadillac CTS, Ford Mondeo, Ford S-MAX, Mazda2, Mercedes-Benz C-Class, Nissan Qashqai, Infiniti G37 Coupé and Volvo C30.

Which Audi though has the better chance of winning that World Car of theYear award?

I'd say that the Ford S-Max will win it, only because it looks like a minivan that ate an ST-260 :D