I'm thinking that they will release a 3rd character for all types. If this is indeed what's on their mind, it is possible that there will be a 4th job.
Hybrids (like Diva, Duelist, Cyber Hunters) will advance to the 3rd characters' 2nd job path.
Well, it is a possibility. 499 TM is way too many unless they will just keep on releasing new skills.