Yes it will - Every game including every SE game as of late has microtransactions. They even stated the Mog Station is set up to incoporate a cash shop of sorts. We already know the first item we'll be buying with actual money is Fantasia Potions. Considering how much people like fluff and useless items like Minions and Mounts it's guaranteed it will happen as other sub based MMOs offers it. (they all do nothing for gameplay uinless someone can show me how it raises my ilvl or unlock new dungeons)

Even XI tested out the 'cash shop' idea by selling Destiere Berret and Chocobo Shirts item codes for $4 each, it went over pretty well.