maybe they are simply expressing that it cost more to make... seriously you guys get your panties in a bunch, microsoft is a multi billion dollar company. it could be a halo MMO FPS where you can pilot UNSC ships in space and launch attacks on the ground to support some other guy in a warthog trying to flank a wraith only to get pwned by a banshee.
i'm guessing AAAA simply means cost more then AAA, which as long as the game is decent i don't care. the more exclusives xbox gets the better.