I guess GSP is out of his title fight at UFC 137. All I know is it is some sort of knee injury, but I don't know how bad or how long he'll be out. I will go out on a limb and say it doesn't have to be all that serious for Georges to pull out of the fight, because I know that he likes to make sure he's 100% before he steps into the octagon.
Very telling, thanks for giving your opinion, Matt. I think rnc's comment is right on the money.