User blog comment:PokemonFan2017/The Characters that may or may not be unlockable in SSF2/@comment-920954-20170811044720

Developers commented in the past all the content from demos up to Beta is gonna be starter in the following version. Heck, even MG posted a photo of the character selection screen claiming that was the starting roster of SSF2. I highly doubt they will change that, but who knows?