. I think logically, one of them would be some sort of priest or cleric
I could see it being a barehanded/monk type vocation as well. Staves are in the game, but a class that uses a staff as a weapon instead of a spellcasting tool would be interesting, and monk or a hybrid thereof would be a good way to do that, and fist/claw weapons are another popular weapon they could use. Also, mages are basically already clerics, but splitting off their support magic to another class would be a good move.
I've got my fingers crossed for summoner being in the game, as I tend to enjoy those (at least when done well... I've seen a lot of crappy summoners that summon some shitty familiar that barely does anything) but I could also see it being something like a ninja or psion class.
Druid would be another archetype they could fit in somewhere.