I'm being selfish, I really want SAM tank. If they do Samurai DPS i'd rather see it be more of an Iaido based type of swordsmanship.
I feel like Redmage should be a melee support DPS as well. Red Mage has never been designed in FF to deal large amounts of damage ( it could, but that was generally design flaws). It was supposed to be a job that could do a plethora of things, and a support DPS is the closest thing to that role in this games architecture.
