There's going to be a lot, but I'd imagine it'll all go into the next financial year from April 2018 to March 2019 (I expect at least one of Metroid or Bayonetta 3 to be pushed back toward the end of that timeline). Bayonetta 1 & 2 are getting a ported version to Switch in February next year, including a Collector's Edition with a Steelbook. The second game is a download code in this bundle, however.
Yoshi & Kirby games are confirmed for next year, and I think we'll see Mario Maker and Smash Bros. Those two would probably be the end of Wii U ports, after Bayonetta 1 & 2 as well (though I think Mario Maker and Smash would see far more enhancements). But that's four first party games confirmed already, with the likelihood of Pokémon releasing in around a year's time as well. I believe a new main series Fire Emblem game is also confirmed for 2018, totting that up to at least six first party titles between April - December. Animal Crossing, Donkey Kong, and Pikmin are games I am sure are in development, but Nintendo will have to hold back on select ones or there will literally be too many games releasing in one financial year. Nintendo also re-applied for the trademark of Eternal Darkness, which may see a remake or a new game in the series finally, unless we're getting GameCube games at last!
Speaking of GameCube games, come January Nintendo will launch the paid online service, so on top of all these games, we'll get a much better online experience and likely a whole host of eShop games / a new virtual console... That's not even going into any third party titles...