In one of the recent interviews, Yoshida touched on where the armoury system is likely to go -- They're either going to add in advanced jobs or rework the current system to organically change your job title based on weapon and current skills equipped.

I'm interested to see what route they go with advanced jobs, if they take it in that direction. Unlockable jobs like in FINAL FANTASY XI doesn't really fit the current world very well. Maybe a job tree that allows the player to branch off once they hit 50 and above? Lancer could become dragoon, conjurer could split off into Black Mage or White Mage, etc.