Well looking at the new 2.2 patch video dual dagger class confirmed!? Because Thancred!!! http://www.youtube.com/watch?v=uwPAj8ivQ-8

So Thief/Ninja could be a future thing :3 Get the class from him, Ninja from someone from Doma. And just to plug Dancer because I want it, get Dancer from F'lhaminn or one of the random dancer NPCs in Ul'dah/Costa del Sol =p