Already available:
-Nintendo Land
-Zombi U
-New Super Mario Bros/Luigi U
-Monster Hunter Ultimate 3
-Lego City Undercover
-Wonderfall 101
-Pikmin 3
-Zelda Wind Waker HD
-Mario 3D World
-Donkey Kong Tropical Freze
-Mario Kart 8
-Hurley Warriors
-Bayonetta 2
-Super Smash Smash Bros.
-Toad's Treasure Tracker
-Splatoon
-Yoshi Wolly World (if you are in PAL region)
Coming:
-Mario Maker
-Xenoblade X
-Star Fox
-Fatal Frame
-Zelda U
Wii Backward Compatibility, Virtual Console that supports NES/SNES/GBA/N64/DS/Wii games (if you hack vWii with Nintendont you can have GC games too), Off TV play via gamepad.
Wii U is really one great console if you love Nintendo games.