I wouldn't mind any new job (hoping for a healer next, possibly Geomancer, maybe Chemist) but my pipe dreams include introducing new roles to existing jobs as, essentially, new jobs (with completely different skills, possibly retaining some of them for flavour and these could work differently depending on the role). I think someone said the same thing above but I would think that they would level separately if they were to be introduced (would be nice if not though). This is so that there could be, say, new job quest NPCs (or it could be the same trainers, just a different story line altogether) for lore reasons since some job story lines like the healer cement the whole healing aspect.

If they were to introduce this, I think it'd be really great (and would give me hope for functional BLU and healing DNC xD). I also think this would get rid of the disappointment with many expecting future jobs to have certain roles (*cough* DNC and RDM to a certain extent?). You never know, they might run out of new jobs to think of in the future, especially previous Final Fantasy jobs.