All Classes Open Through February 26!

I think if/when we get Hayato/Kanna we're gonna get JMS' 24 character slots.

Though with all these damn link skills and character cards I'm not even sure if that'll be enough...

It won't be.
We already have 6 new classes coming: Demon Avenger, Xenon, Kanna, Hayato, Thunder Breaker, Wind Archer.
That exactly fills up the space from 18 to 24.
When they revamp the next 3 Knights of Cygnus, we'll need more slots.