Who do you think is likely to be cut?
Personally, I don't think any of the Fire Emblem cast's in danger given Lucina and Roy's popularity and Fate's success.
I can't see them cutting Dr. Mario after bringing him, Mewtwo, and Roy back from Melee.
Dark Pit's a little iffy, but I think Sakurai would prefer to keep him since he takes such a small amount of development time to implement anyways.
Miis I guess there's a case for since they're so much work, but they're also stupid popular and likely made tons of money for Nintendo with the costumes.
i have this theory that we might have veterans who are clones, keeping their clone moveset, allowing to change the original, such as dr mario, and odissey mario, and toon link and BoTW link, its the smartest move to statesffy the greatest ammount of ppl rly.
all the old mains just need to adjust to a slight change in hight or something else, but keep the base movepool,
and the new fans who come from the new games
i also think that the baloot of smash 4 might have been a majo factor for this smash, since every character that made sense to them is in already,
characters such as banjo and kazui, rayman, ridley, inklings, simon or trevor belmont. King k rool, are all candidaes for a slot since their request has now weight. ppl have voted for them to such an ammount PROPABLY that sakurai sees their potential as natural.
also what another theory is, we had a chance to get inklings as dlc last smash, maybe the engine did not support them back then, and it has been updated heavily, which MIGHT actually mean that options are now open, and with that the chance for until now impossible characters rises.
things like the iceclimbers on 8 players might be a start,
ridleys wings along with backgrounds and cliping could also be a problem with the old engine
inkling ink,
arms .. well moveable arms,
simon belmonts wip perhaps?
physics in general, and if the rumors are true, and this is more like a mix between melee and smash 4, then this makes ALOT of sense.
so i see a high possebility for characters such as that