Well we already know musketeer will be the base class, I think it will get a dps/support job in the form of either Fusilier or Canoneer the way the class played in tactics advanced 2 would fit ffxivs style very nicely. And other job if the rumors are true and the class does have a choco pet I could see the other job being Chocobo Knight and being a tank class that swaps hate back and fourth between it and its pet.