My guess for what 2018 will hold for the switch, (some confirmed, others are speculation.) In regards to Nintendo's line up, not particularly third party, are as follows
Confirmed: Fire Emblem, Yoshi, Kirby, and Bayonetta 1&2
Speculation: Animal Crossing, Pokemon, Bayonetta 3 (Might be 2019), A couple more WiiU ports (My guess would be Mario Maker and WindWaker HD.), Possibly a new IP of some kind (No basis for this, just a gut feeling), and one or two Third Party Licensed titles (See Hyrule Warriors, Mario and Rabbids, and Fire Emblem Warriors.)
As for 2019, I think that is when we will see Smash Bros and Prime 4.