Chemist, Geomancer, Dancer, and Beastmaster.

I'll be the odd one out in the roles though. I'd like to see Chemist and Geomancer as healers. Chemist can mix things for differing buff/heals with a system similar to NIN. Geomancer can plce heal/shield/buffs in an AoE around a target as special terrain.

Dancer I'd like to see has a support melee, kind of like NIN.

And Beastmaster I'd like to see as a melee pet class. Need a whip to go with F highlander hempen underwear.