After doing some more research, it seems like if Mega Man X9 is a thing, it would be pretty early in development by this point given what those in charge have said. Still think we'll get a teaser though, alongside the reveal of Mega Man Battle Network Anniversary Collection. I think X9 will be revealed becasue the Legacy Collections surpassed 1 million sales, something that's apparently uncommon for the Mega Man franchise.
As for Sonic...I think we'll get a classic collection and "Sonic Project 2021" which would obviously be a modern thing. It could be an Adventure remake tease, but I'm honestly losing hope for a remake. (Hopefully I'm proven wrong).
And as for Smash. Double reveal just makes too much sense given we have two fighters left (unless we factor in the bonus character theory, but that's a whole other can of worms). If it's a single reveal, a Capcom character. I know they got a few Mii Costumes last presentation-that does not disqualify them from getting a fighter. Anyone's guess as to who-a Mega Man character (preferably Roll or X) would be awesome, but it's leaning towards Phoenix Wright in my eyes. Dante is also a possibility. Hell, they could shred the Spirit Event rule to pieces with Jill or Leon-that'd be awesome, I love it when they do stuff like that. If this is a double reveal, Capcom and Sega. Sega character would most likely be Eggman, but Sakura and Arle could possibly steal that from him. We could even get someone completely unexpected from Sega-Blaze would be really cool, and even though it would never happen, Beat would make for a cool revival of a character. Happened to Banjo.
Other than those few things, I think we'll get a better look into Elder Scrolls 6, Mario + Rabbids 2 will be announced (with playable Rayman being the big end reveal), trailer and release date for Cuphead's DLC, Mario Golf Super Rush will have a short 4 minutes of time to announce new characters and smaller features, and Street Fighter VI teased. Think that's all my thoughts there.