In order to put real cars in video games, game studios need to buy licenses from automobile manufacturers. Remember that Cayman shooting brake/breadvan mule recently spotted on the streets of Europe and supposed by many commenters to be a fake? It's been captured in Forza Motorsport 3.
While this doesn't mean we'll be seeing such a conveyance on the roads any time soon, or that it is in fact a Porsche product and not a tuner special, gamemakers Turn 10 would need to have spoken to Porsche (or whomever is responsible) about including a car that no one even know about a few weeks ago. If this is all real then, after the unlikely Panamera, could the next item on Porsche's list really be a mid-engined mini wagon? Hat tip to Mike.
[Source: Forza Central]