My money is on ReCore, Super Lucky's Tale, and Ori and the Blind Forest. Lucky and Ori should be able to run on Switch easily since neither is that graphically demanding. ReCore would need some downgrading, but nowhere near as much as any of their AAA games would need. Rare Replay might be a possibility, but would be too much work I'm sure, porting 30 games to Switch. Some individual Rare ports might happen though.
I can't believe this is really happening! This E3 is gonna be amazing!
I'm trying not to get too overhyped here, but how could they not at least port Ori? And at least something from Rare will have to come over eventually.