They have access to source code and all the low-level stuff in both the GC/Wii and Switch, so who knows yet. Seeing as how they already have GC/Wii games running on what is essentially Switch hardware, my prediction is that we'll be seeing something at E3 about it.
Also, the fact that Kirby Star Allies runs at 30 fps in the game stages and then tantalizes you with 60 fps at the goal game jump thing at the end of the level makes me wish they had a switch to enable 60 fps all the time, at the cost of DSR going lower
Also, the fact that Kirby Star Allies runs at 30 fps in the game stages and then tantalizes you with 60 fps at the goal game jump thing at the end of the level makes me wish they had a switch to enable 60 fps all the time, at the cost of DSR going lower