Have the devs commented on future jobs yet?

[Mazi]

We then asked Yoshida whether other classes will have access to multiple jobs, much as Arcanists can dabble in Summoner skills. He said that we'll probably see more of that in the future. There will likely be existing classes made able to branch off into other jobs, and he does consider it highly important to have variety and lots of flexibility in the game's class system. Also under consideration is the possibility of combining two jobs to form a third, such as White and Black Mages combining to form a Red Mage.

He also laughed and mentioned that there's a "high possibility" of new jobs debuting prior to future expansions.

http://massively.joystiq.com/2013/09...expanding-fun/

Oh man so glad this guy posted this lovely interview from PAX that people should definitely read :O