What We Expect to See from the March 8 Nintendo Direct

Nintendo has finally broken its silence and announced a new Direct for tomorrow, March 8 at 2pm PT/5pm ET. We're not exactly sure about what could show up during tomorrow's showing, but we can certainly jump on the hype train with our predictions.
We know for sure that the Direct will focus on both the Nintendo 3DS and Nintendo Switch, as well as a specific breakdown on the upcoming Mario Tennis Aces. So new footage and info on the upcoming Detective Pikachu for 3DS, Kirby Star Allies, and Donke