I think early next year may be pushing it. I could see it being an E3 2018 anouncement.
It's rather crazy. Pure speculation on my part based on rumors, development teams, hiring postings, etc. However, these are some titles Nintendo will likely be publishing for Switch in 2018/2019:
2018-
Fire Emblem
Kirby
Yoshi
Smash Bros
Mario Maker
Animal Crossing
Pikmin
Bayonetta
Retro Studios game
2D Zelda
2019-
Pokemon(I think it will get delayed to Spring 2019)
Metroid Prime 4
New Monolith IP
No More Heroes 3
Another 3D Mario game