Cramming your game full of all the most exclusive sport cars is something that most racing game developers in the world pride themselves on, but Forza Motorsport 4 will not contain any Porsches.
Forza Motorsport 3, contain a massive 35 different Porsches, but Microsoft and Turn 10's Dan Greenawalt have not been able to negotiate with EA about sharing their exclusive license. On the other hand, Microsoft holds the exclusive rights to include Ferrari cars in PC and Xbox 360 games, but they saw no reason to prevent other games from having them.
Terrible news for fans of Forza and Porsche.