I speculate Archer and Lancer based on current trends. It'll be majorly disappointing if it's boring old Lancer + Pugilist like they gave NIN and BRD, the other two DEX classes, but it could unfortunately happen.

Though as the person above mentions, they could change it up in 3.0, or Machinist might have its own TP restoration traits/ability that make Invigorate not needed on a TP user DPS for once.