Odyssey and Samus Returns are the big two, and I've also had my finger on the trigger for Hollow Knight (Switch) ever since the port was announced. Those are the games I'll shove everything aside to play. Already bought StarCraft: Remastered, too.
I have a few other things on order, too (Rabbids, Xenoblade, etc.), and I'm keeping my eye on a fair number of indies, but I could wait on any of them if push came to shove. I've already cut a few corners this year on games I would usually pick up right away, particularly on 3DS.