I hope this is the case but I think they could have issues with interpreting the Upad as a Wii Classic Controller, sideways Wiimote, or similar as there can be issues with that sort of thing, like how GameCube games couldn't be played with the Wii Classic Controller for example, since they interfaced in completely different ways. If WiiU is running Wii games in some kind of Wii mode like Wii run GC games in GC mode without any extra functions available then it could be in the same situation. Although VC handling could probably be updated to include these features. But playing the non motion heavy Wii games on a nice native 480p screen with good ppi would be sweet and way better than my shitty old 14" SDTV. Although now I mention motion there are other potential issues, like if the Upad's motion sensors are compatible with the Wiimote's for games like NSMBWii and DKCR.