If we are using AAA as it normally is used there are more likely more AAA XBLA/PSN games than retail games. Full production, full staff working on them, full output of a studio concentrating on that one game. But I am assuming someone has attached an arbitrary cost that a AAA must have spent on it or a minimum number of staff? Or attached a particular aspect of the game that must be done at a particular level. For instance if it is texture quality than Skyrim can't be AAA but many XBLA/PSN games can. Sound, the same. Size, the same.
Then again I just find AAA to be nothing more than a weak attempt to say really fucking expensive and advertised until small nations are bankrupt. They certainly can't mean GFX as some games recently pushed by their studios as AAA are fucking atrocious. Just seems a waste of a term now I guess.
AAAA well...that is just MS being stupid