Things I’d expect.
Release dates for FIFA, Rocket League and Xenoblade 2. Some hefty footage of Fire Emblem Warirors given all ever seen so far has been cut scenes I believe… More characters and stages on ARMS and Splatoon 2. Hefty Zelda DLC info. May be a third party round up too of LA Noire, Skyrim, FAST Racing Neo, Rabbids DLC etc.
Things that’d be cool.
News on those Bayonetta ports. Virtual console update. Reveal of DKCTF and Smash coming next year. A Metroid Prime 4 tease, even if it’s just some music. Dark Souls port. Whatever this other Bethesda Switch game they’re working on is.
These things are usually more info on things you already know about though. Rarely unveil big new things.