It's a little painful to see everyone talking about Square Enix so often now, and so freely, yet here I am resisting the urge to go insane and begin clamoring for 2B, using conspiracy theory-level assumptions to say it's 2B.
Assuming this Square Enix rep is shown off as early as Dec. 6, and Sakurai really isn't accepting characters from after early 2016, I'm hoping it's the Slime just for the nostalgia I hold for it and the franchise it's from. If not, I somewhat hope it's Geno just to appease the large fan-base he's garnered in the Smash Community globally. Regardless of who it is, I'll be happy either way, especially if it's Sora. I'm buying the Fighter's pass anyway,
Though, something to note is that Vergeben has a list and he's checking it twice. He's stated that his sources have outright stated that some of the 7 characters he's been told are not the one. How many out of the 7 aren't it, and which, however, he hasn't stated. There's a chance more of his sources will come forward to him and continue to narrow down the list of who it could be before we even hear the official announcement.