What I'd like to see :

GLA -> Dark Knight, DPS.
Could have an ability to erase enmity and use it to deal more damage (meaning, the higher you are on enmity list, the more damage you do... would make use of those enmity + skills from GLA...) along those "use hp to deal damage" stuff.

LNC -> Templar, Tank.
With some magic to debuff target, and negates the damage it does, instead of reducing the damage taken, making it an interesitng tanks against bosses who likes to AoE a lot.

PGL -> Dancer, Healer.
Adding various stands (or steps) to give some effects on its existing weapon skills, like "heals the two party members with the lowest hp percentage" or "heal party member with the highest enmity toward target"...

ARC -> Beastmaster, DPS.
Getting a pet to have some variety on attacks, and buffs to make it usefull. Maybe add some traps-skill with aoe effects. Not too sure about this one though...

THM -> Oracle, Healer.
Using the umbral ice and fire in a totally new way, making so that on ice, you can target ally, and on fire you can target foe. Getting rid of the mana regen, and getting some skill to help switch from one to another, for example. (Get ready for my healing fire 3 ! )

CNJ -> Geomancer, DPS.
Well, this would be the most obvious one for me if CNJ gets a DPS job. I don't have any idea on how it would work, but it could be a classic caster, with more elemental spells, and debuffs to lower target resistance to specific element.


As for the future class, it's hard to make a guess without seeing the base class skills...