So the most recent rumor regarding the new Soulcalibur right now is that the full roster will be 39 characters and Geralt is gonna be the (or "a") guest character, and so far it's looking like at least Geralt is gonna be in.
The rumor came from ResetERA last week, but today this guy from CDProjektRed tweeted this little nugget.
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Right now it's up in the air what, or if, they're really teasing anything at all. But I doubt it's for any other game that isn't Soulcalibur VI. Unless Switch is getting The Witcher Collection and Geralt is gonna be in Smash or something dumb like that.
Anyways, Geralt makes a lot of sense. But he's also a really boring choice to me. Especially looking back at the past guest characters not named Ezio. That said, I'm sure he'll be alright, and if the 39 roster is true then **** I can't complain.