I would like to add that what I said about the music test screen gives us a big hint that we will be getting 3 more new franchises that have multiple music tracks tied to them
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Future DLC can go into the other screen. Also, a retro(which everyone seems to be sleeping on) has to be coming, and they would be in that screen as well. Combine that with the Incineroar leak that means 2 newcomers that we are sure one (Incineroar and retro) will not get new icons. that leaves us with a guaranteed 3 more newcomers at least. And even then, Geno may just be lumped with Mario even if he gets his own stage, so that means we can expect 5-6 more unique newcomers.
With that, stage wise, those 3-4 unique newcomers may have a stage, as retro and incineroar may not get one. I would assume at least 3 of the newcomers would get stages, as they will be getting unique music icons to go with those stages. if the minecraft leak is right, one of those 5 could be the minecraft stage. That still leaves us room for the three newcomers we know have to get stages due to the music icons. Minecraft wouldn't get its own music icon, as well, not much music there. Most likely will go into the other icon like the other stages that have no character tied to them(hamebrow)
so with 5-6 more unique fighters coming, and if the Smashdown theory is right that the final bast roster needs to have a selectable roster thats divisible by 2, 3, or 4(basically a multiple of 12), then 84 final base roster needs to be the thing. given how the website says we currently have 72 selectable fighters(as pokemon trainer counts as 1 and each mii fighter counts as 1), its safe to assume we are getting 12 more fighters. with 5-6 of them being unique, that means we should expect 6-7 echos. I think it may be keeping it safe to say 6 uniques and 6 echos.
as stated before, three of those uniques are pretty much set. A pokemon(Incineroar), a retro(as every game has had one and sakurai will always give us 1 random wtf retro), and a square enix(most likely geno) so the other 3 can be all new franchises if Geno shares the mario icon for music wish, or 2 will and 1 will be a newcomer from a series already in smash.
FOr the retro, thats the hardest to guess. Lip, Mach Rider, Donbe and Hikari, Ayumi Tachibana, Prince Sable, ect. Good luck guessing this one, but any of those, and more, are possible
If we look at the first option, we have quite a few likely choices here for 3 new series reps. Isaac, Banjo and Kazooie, Shantae, Rayman, and a Namco rep(Tales of or Tekken) are the most likely of all those.
If we have the second option, then we will have 2 from the above, and 1 newcomer from a currently represented series. there are far too many to list but likely ones are Bandana Waddle Dee, Elma, and Skullkid. Personally I feel skullkid is a boss as that is what I feel sakurai would do.
Echos there are a bunch of options. Pick 6 of these possible echos. Ken, Medusa, Dixie Kong, Shadow, Ms Pac Man, Impa, Black Shadow, Octoling, Ninten, and Felix.
so with all that said, I think its very safe to assume as these fact prove, we should be getting 12 more selectable fighters.
EDIT: As for DLC, I can see the game being supported for awhile. Likely DLC characters I see are Rex and Pyra, an ARMS fighter, a Dragon quest character(slime or DQ11), a Gen 3 and/or 5 pokemon(Gardevoir), and some of the other newcomers listed above.