Wii U has been dead so many times already and with only ten million consoles sold it is a miracle there is still coming games for it. Except for the already announced games coming in 2016 there are a few "easy" games that Nintendo could produce. Animal Crossing is one of them. I am a fan of AC but I know that even a HD remake of New Leaf would be sufficient for many people. Maybe it even would sell more than a million.
Off Topic: other "easy" games could be SNES Remix, Captain Toad Two, Nintendoland 2, Luigi's Mansion HD, Yakuza 1&2







