just wanted to mention something about the original post here, I don't think it'll be possible to play GC games on the U although the appropriate mIOS could be installed to play them.
Reason being that GC mode will not work simultaneously with wii mode, because of this there will be no controller inputs. Since the U has no ports for GC controllers the games will be unplayable as GC games do not respond too any wii controllers...
since there hasn't been a hack to change this on the original wii i don't think its likely one will be released now unfortunately