1. F-Zero; F-Zero GX is one of my favorite games of all time, this series didn't have an entry on the Wii, so it really needs a proper entry on the Wii U.
2. Baten Kaitos; Admittedly I only ever played Origins, and I still have yet to getting around to finishing it. But I just loved that game so goddamn much! I really want to see a continuation of that series.
3. Izuna: Legend of the Unemployed Ninja; This wasn't the greatest series in the world. Not by long shot. But it made me laugh and I enjoyed it, so I'd love to see another entry in the series.
4. Bomberman; I've been thinking about Bomberman a lot lately for some reason. I really loved the N64 and Gamecube versions of the game, so I'd love to see another one in that vein.
5. Kid Icarus; admittedly this one is cheating a little since Kid Icarus just got it's first sequel in more than 20 years less than a year ago. But Uprising was amazing and I had heard that they don't want to do another sequel which they need to do because that game was amazing and I loved the characters and now I must have more of them!
I know every time one of these lists comes up I always bring up Baten Kaitos and F-Zero. But those are two of my favorite games of all time, and neither has had a new game made in their series since the GameCube. And I just find that incredibly sad. I really hope a new F-Zero and a new Baten Kaitos come out for the Wii U or 3DS. I would really like that.
Edit: it's cool to see I'm not the only one who wants an F-Zero sequel. I've just noticed at least two other people in this thread who agree! That's exciting.