So let's go through these remasters/remake/new game rumours, shall we?
Metroid Prime: Remastered (CONFIRMED)
F-Zero GX (Nothing so far, but with the GameCube remaster thing, I can definitely see it coming sooner rather than later)
Kid Icarus: Uprising (Sakurai's hinted at it)
Golden Sun Remake (With Golden Sun coming to NSO, I kinda doubt this now. Not ruling it out entirely, but I doubt it's happening any time soon HD-2D pls)
New Star Fox (This is one of the rumours that doesn't have a lot of info on it. I guess we just gotta wait for more.)
Paper Mario: The Thousand Year Door (Similar to F-Zero GX. Since we know GameCube remasters are coming, I can see this happening sooner rather than later)
New Donkey Kong (Okay, seriously, how much longer are you gonna hold off on this, Nintendo? It's one of the worst kept secrets in the gaming industry at this point)
Fire Emblem: Genealogy of the Holy War Remake (I'm not holding much hope for it coming in the Switch's lifetime now. Maybe next console)
New 2D Mario (I have no idea what's gonna happen with this, if it happens at all during the Switch's life. Again, could be a next console thing)
Those are all the Nintendo based things that have been prominent in the rumour mill. I'm not an insider, so idk what's going on. Feel free to give your own thoughts.