Sorry had to go to work. What I mean is, anytime Sakurai presents something, more times than not, he has more to say. Now it could not be the case, but I feel if he were to present The Hero's moves and mechanics, he may have more up his sleeve. That was certainly the case with Cloud and presenting the Geno costume.
So in short, if Sakurai presents, expect something. If not, expect Geno costume returning. Hopefully that answers the question.
EDIT: Think of it this way. It is an odd situation no matter how you look at it. Sakurai went out of his way to make a big deal that Geno's Mii Costume was a thing. Now we have an instance where we do not know the fate of our Star Boy. Is he coming back as a costume? Is he more than that? Or is it nothing? With how big a deal it was in Sm4sh, will it be glossed over? I think Sakurai is the person to address it. Whether through The Hero's video, or a famitsu column stating why he is a costume again even though it was a big deal last game.