The big clue was that the new jobs had something had to do with the Moonfire Fair (there were 3 rangers = 3 jobs). But then again, they only showed 2 figures on the slide at FanFest. Would be odd to only have two though.

We need another scouting class. Right now only NIN can use that stuff.

From the logo, it looks like Red Mage or dancer (that thing she's holding looks like a conductor's wand), possibly beastmaster (looks like a chimera over the shoulder), and samurai (the third person in the logo looks like they are sheathing a sword).