I found this especially interesting, because Metroid is not listed for 2018- so it's not like every single announced Switch game has randomly been thrown into this survey, there seems to be some rhyme and reason here.
I don't know how believable this is, of course, but it seems to lend credence to the idea that pending unexpected hindrances, Nintendo is looking to get Pokemon out this year.
EDIT: Right, I found this tweet via this site (don't ask me how I ended up there)