HeavensNavi
I'm Not A Pikachu
Towns Folk
If it was in the last generation, backwards compatibility. If it was further back, remakes because games can get REALLY expensive if they were popular enough to warrant a remake.
This is exactly what needs to happen. Backwards compatibility with Wii U games would definitely help the NX in the first year or two. It would probably get some good sales for the Wii U's library of games (basically game sales). I'd love to play all my games on the NX if they can do it.