I haven't played Nintendo games in years, but some of this stuff looked really cool.
Open world Zelda (but do you play as Zelda? That didn't look like Link)
Yoshi game looks good
Toad game looks fun too
Splatoon looks awesome, first non-violent shooter ever that doesn't look lame. the swimming in inkn looks like a great mechanic.
Mario Maker looks great
Still not a fan of the gamepad interaction though. Don't really want to have to focus on 2 screens, one of which is in my lap. Like in Splatoon, you raise or lower the gamepad to look up and down, and rely on it for map and traveling to teammates.