I think Sora is owned by Disney though, so I'm not sure if Sephiroth actually affects his chances. But I dunno.
I'm pretty excited for this! I certainly wasn't expecting him. Here's hoping we get actual Spirits and maybe even Mii Costumes of Tifa (Brawler) and Barret (Gunner).
We have 3 spots left. Assuming Seph does kill Sora's chances, Rex & Pyra/Mythra would be my number 1 pick, and I really hope it happens. None of the newcomers save Ridley and to an extent Joker were ones that I really wanted. Not to say they were disappointing! I like all of em. They just weren't high on my list, is all.