A'ight, so two things to say here.
1.) I strongly agree with the people who've been saying that the newcomers will mostly be popular fan requests this time around. Of course, I've seen people who've disagreed with this, but they're the ones who think an ARMS fighter has a chance of coming to this game. Popular fan requests I've seen are mostly Ridley, K.Rool, Geno, Bandana Dee, and Isaac. And I guess Simon, but only because of Vergeben, who probably has no friends and wants that sweet, sweet internet attention. We've already got Ridley, but I think Vergeben is full of ****, so if Simon actually gets revealed halfway between now and release, be afraid, because that'll mean that we probably don't have any/too many newcomers left.
2.) And speaking of ARMS fighters, I really wish people would stop predicting/requesting them. The game didn't even get support for a whole year as it was originally planned, and Yabuki even came out and said that he was flattered, but there wouldn't be an ARMS fighter in the game. I think if the producer of a game has to come out and actually state something like this, they're telling the truth. I don't think ARMS was popular enough, and you can pull up all the fan art you want of Spring-Man sippin' tea with Pikachu, I don't care. They have less of a chance than Waluigi getting in as DLC at this point, and that's saying something (not a Waluigi fan, but if Reggie publicly states that Sakurai will be made aware of his demand, that's something to grab on to at least).
Sorry, but I just see it this way. Also, regarding the "advertisement" conversation quite a few pages back, I know a lot of Nintendo fans out there who don't like Smash at all (despite who makes it in), so what is the point of the "advertising a character because they're new" argument? Popular fan requests make the most sense for what seems to be Sakurai's last Smash game (or for a while). If Nintendo fans see a new game coming out (like people who picked up ARMS), they're gonna pick it up because it's Nintendo. Characters like Spring-Man just don't make sense to me, because I just don't see ARMS 2 being a thing.
EDIT: Some words.