At this time in 2017 we knew about
Kirby Star Allies-Spring 2018
At this time last year we knew about
New Super Mario Bros Deluxe-January
Yoshi's Crafted World-Spring (delayed from 2018)
Fire Emblem: Three Houses-Spring (delayed from 2018)
Marvel Ultimate Alliance 3-2019
Daemon X Machina-2019
We currently know about
Tokyo Mirage Sessions-January
Animal Crossing: New Horizons-March (delayed from 2019)
Xenoblade Chronicles DE-2020
No More Heroes 3-2020
Bravely Default 2-2020
Breath of the Wild sequel-TBA
Its pretty much the same each year.
Last year we had at least seen gameplay of Luigi's Mansion, Yoshi, Deus ex Machina, Fire Emblem.
Also I'm talking about NEW games, so not Xenoblade DE or Tokyo Mirage Sessions.
No you said, "Even compared to usual, we know so little about next year's lineup."
I provided a list of every known Nintendo published title at this point in time each year and all 3 lists are about the same.
Adding qualifiers like gameplay or new games doesnt change that, this is a pretty standard amount to know at the end of the year.