UMD movies — remember those? Yes, they’re the little discs that slide into the rear of Sony’s PlayStation Portable, and it’s been ages since a major motion picture was released on the format. In a crazy, wild world just years from now, we could be saying the very same thing about games.In what Sony is describing as a “one time test case,” the outfit is releasing the forthcoming title Patapon 2 as a digital-only title. In other words, the only way you’re playing this game is if you download it. In case that’s