Ignoring the obvious archetypes that will inevitably make it in-game, I would love to see something akin to an aquamancer (or if you really want to get fancy, how about a cryomancer?)
How about a fighter with telekinetic abilities to give it more of a support/crowd control roll? To be able to use his mind to push enemies away from himself when he is in danger of dying or the ability to pull enemies to himself and away from his more squishy companions. Of course, he would naturally be able to move objects within the environment. His class-specific dialogue or abilities should also have plenty of Star Wars references.