Pokken Tournament - A hardcore Pokemon fighting game. Something unique, yet standard enough to be played and respected at tournaments like EVO.
Diddy Kong Racing 2 - A kart racer with the polish and AAA feel of Mario Kart 8 with the hub world, vehicle types (Karts, Hover karts, and airplanes,) item upgrade system, and boss races of the original Diddy Kong Racing. Adding new ideas like animal themed karts and lesser known Nintendo characters like Dillon and Sakura Samurai would make this awesome and a worthy brother to Nintendo.
Super Mario Football - Nintendo is missing out on to many sales, not to mention a really great game, by not making an American Football arcade sports game. I love the Mario Sports games and Mario Football is sorely missing from that lineup.
Super Mario Basketball - See Super Mario Football.
Super Mario Paintball - Yeah, I like Mario games. Honestly more than the platformers sometimes. Splatoon is a refreshing addition, but I'd love to see a real 3rd person arcade shooter with Mario and friends.
Mario Strikers and Mario Tennis - That was the last of Mario games. I think...
Donkey Kong Planet - I desperately want to see a 3D donkey kong game grace the Wii U, but I want it to be more of a strict platformer like Donkey Kong Country and Super Mario 64 than Donkey Kong 64 was. No collectathons. Just platforming. Donkey Kong Country 3 did a cool thing with its interactive level selection overworld, so it would be awesome if they could translate that into 3D with this game. I just want a donkey kong 3d game with the polish of super Mario galaxy.
Fatal Frame - One was just announced. I just want it localized. And marketed well.
Kid Icarus - I'd love to see a kid Icarus game on the Wii U without the rail shooter sections. If they replaced that with free flying instead, I'd love it.
-----
What about you?