As someone who is in the games industry, (and I think someone who isnt could come to this conclusion too) that it makes little sense to develop an entirely new model (Not just a new outfit!) for two characters, one male, one female, especially when one (Pelagos) is transitionary for his later look. Not only that, but with armor compatibility, it seems almost certain that the intent is playability.
If I had to spitball, it'll probably be a 9.2.5 release, and a pre-order bonus to get people buying the new expansion.
I don't think it's a huge leap in logic to say Kyrian probably isn't the only one, going by the logic that this will likely be playable.