I know it's been a week already since Cloud's been revealed, but I just had a theory today about another new possible Mii costume that could be coming to Smash alongside this DLC, and it makes a lot of sense too. Geno from Super Mario RPG.
I'd kinda be surprised if this doesn't happen. It could be a Mii Gunner costume, but seeing as all the other Mii Gunner costumes use a physical projectile-based weapon and Geno's weapon is built into his arm. I'm not entirely sure how this aspect would work without having to possibly tweak some of the animations. It's a great idea though, and they really should do this.
Sometime after the latest (and sadly, last) Super Smash Bros. presentation I learned that apparently a Geno hat was leaked as a Mii costume. I must've missed that tidbit of info cause I made this prediction solely on hindsight. I'd still like to give myself props, but I wouldn't have called Bayonetta and especially Corrin. Although I was kind of predicting Corrin would possibly be in the next Super Smash Bros. game and I was even considering making a moveset for him/her.
Just wanna throw this in too, next Super Smash Bros. game; 9 Fire Emblem characters! So much Fire Emblem. So much. Very early prediction here too, Lucina and Roy are cut and they free up space for one new Fire Emblem character. Marth, Ike, Robin, and Corrin all return as veteran fighters.