Not much, I just want a better output of games than what Wii U had. Price doesn't matter.
1. The system should have a AAA Mario and a AAA Zelda during the first year. So if it launches Christmas 2016, by Christmas 2017 both Legend of Zelda: Open World Adventure and Super Mario Galaxy 3 should be released, preferably Zelda in 2016 and Mario in 2017.
2. I also want RPGs, minimum 2 good ones per year - Xenoblade, Fire Emblem, Tales games, whatever. Xenoblade Chronicles X. If Nintendo can get back Dragon Quest, all the better! Ports of Final Fantasy 7, 8, 9, and X would be above and beyond! I don't care about the ones afterwards, except for the FF7 remake.
3. Much bigger Virtual console access. More up to date hardware should have access to MORE games, not less. Right now the Wii has WAY more Virtual Console games than Wii U, and better ones too.
4. Have at least 3 other A/AAA titles to show off for the future: like the next Xenoblade, Mario Kart 9, New Super Mario Bros, Pokemon, 3D Donkey Kong Country, etc...
5. Have at least 5 B games per year like: Super Mario 3D World, Kirby, Lylat Wars, Advance Wars, Metroid, 2D Donkey Kong, Smash, Animal Crossing, Pikmin, Wario, F-Zero, etc...