"For the past several days I have been reading statements made by St. Pierre and Greg Jackson about our fight on January 31. St. Pierre claims that he is “not a cheater” and that he and Greg Jackson will have “no problem with a rematch in the summer of 2009.” To the untrained eye the grease might not look like much, but every grappler knows the effect that it has. Being able to apply your submissions and sweeps or just being able to hold on to your opponent to defend yourself from being hit is absolutely critical! There is a reason why you are not allowed to put grease anywhere on your body except for the area around your eyes. Because of the grease applied to St.Pierre’s Body the Nevada State Athletic Commission’s executive director, Keith Kizer has stated that the Penn-St. Pierre fight “definitely wasn’t fair”. I hereby accept George St. Pierre and Greg Jackson’s challenge for a fight in the summer 2009. Lets call Dana now and set it up."
With the business UFC 94 did (probably the most PPV buys in UFC history, by a decent amount), it's difficult to imagine there will not be a third fight. We'll see GSP/Alves and Penn/Florian first then it'll be GSP/Penn III some time in the early fall. Anyone thinking this won't happen should consider the UFC put Brock Lesnar into a title fight with Randy Couture because they knew it would make loads of money. If that fight could be rationalized, a third between GSP and Penn shouldn't be a problem. It's gonna happen. It's just a matter of when.
(Quote is from BJPenn.com. Unfortunately BJ continues to require registration, so it's not possible to link to stuff directly.)