My money would be them going the Nin route. Int as a main stat so they share accessories with Blm/Smn and separate "of fencing" or something pieces that stylistically fit the job more than the heavy robes of BLM/SMN i.e. Nin switching up whether it shares designs with Mnk or Brd. Rdm may also need a boosted Def stat (higher than caster/lower than melee) since it may have to deal with animation locking and being in melee range.

It really just comes down to how SE envisions the class looking.