If we continue off the fact that we were given 3 specific jobs as hints last year, Samurai, Red Mage, Blue Mage, then I'm going to have to say Blue Mage is the ideal DPS candidate. People who want RDM as a DPS almost always claim that it's because they want a swordmage, which is the strongest identity that BLU can lay claim to. Whether you go with the superhero Blue Mage look or the Middle-Eastern Blue Mage, both are sword wielding magic users. BLUs would have access to the "devastating" enemy attacks while being able to provide some small level of party support, like White Wind possibly.