I'm fairly sure what they will end up implementing is either a Job system that replaces the Physical Level... for example, If you level Marauder or Gladiator, your playing as a Warrior. Physical Level changes to Warrior Level.

Or, Job System will be totally new added onto what we have now... meaning you do a quest, unlock a Job, then equip said job. By equipping a certain job you would lock certain spells, and make other spells better.