Here's a roster I wanna try, although I agree with my last one better (It's more of an alternate as it relies on a completely different situation):
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Wolf:
STOP! I didn't remove Wolf because of Pooper Maria and Titra. I had him removed from the last roster too. I don't think he's coming back seeing as he's not a majorly significant character and is a third Fox fighter. You're probably gonna argue that he's unique and planned for an installment prior to the one he was in, but so was Mewtwo and he was WAY more important than Wolf. I think Wolf was only really kept in for fan demand.
Mach Rider: It's much more likely that Mach Rider is going to be seen as too similar to Captain Falcon, but the last direct showed me that a lot of things are changing. I don't have Takamaru because I feel Greninja has tragically stolen his niche, so there is really no other retro I can think of.
Pale Tuna: It seems Palutena is really being teased right now. But, Pit's Sacred Treasures would have been a final smash regardless and the while I thought the Pseudo Palutena fake out was enough of a confirmation, you shouldn't look too deep into Sakurai's updates. The massive Kid Icarus content is the one and
ONLY reason I even consider her remotely likely in the first place.
Tetra: I see no better choice (*cough*
vaati*cough*). A lot of people tried to convince me that Sakurai doesn't care about newcomers long as we got the meews when I tried to add Genesect, but here we are with Greninja. I don't think it's at all risky to say that Sakurai will probably want a Zelda newcomer and I see no real reason why Tetra shouldn't be added. Sure there would be characters who are of Zelda's family, but I doubt Sakurai will care terribly as long as they have different names and identities.
All in all, I think my last roster was better, but I made this one in case things go down the other road.