Hollow Knight on Switch doesn't have a date yet, but it's actively the next platform release from the developers, and given how quickly a lot of indie software has been turned around for the system (and how short the notice has typically been for final release dates) I'm hopeful for a release in May or early June. It's the only surefire day-one purchase for me between now and E3, should it arrive in that window.
I'd like to pick up Fire Emblem Echoes in case the physical copy goes out of print quickly (you never know with Fire Emblem in the post-Awakening environment), but honestly, I'll be lucky to get to it by the end of the year; I'm not even through with all of the Fates campaigns yet, and where my 3DS is concerned I still have Bravely Second sitting around unplayed. Likewise, Disgaea 5 interests me, but I just won't have the time for it if it's as hefty an experience as people say, so I'm fine with holding off on it for now.
Ultra Street Fighter II will eventually be a necessity on my Switch, but Capcom has set a clear precedent for steep digital sales on the eShop, so I'll wait. The initial cost of entry is too high.