more info found here- http://blog.us.playstation.com/2015/...d-new-details/

In regards to new jobs- " extra jobs" - “We were actually recently deciding what to call these jobs that don’t have a base class, and we’ve decided to call them ‘Extra Jobs.’ Just like when you can switch to different jobs when you’re at level 30, that applies to these as well. As long as any class or job is at level 30, you’ll be able to access any of these three new jobs.”

And new skills-
Yoshida: It’s tricky to say, but there will be changes applied to each job. One common change is that the job quest will continue from where it left off starting around level 52, so you’ll obtain new skills, spells and weapon skills. So when you go into combat you’ll have a wider range of selection in what kinds of actions you can take during battle. For example, if you play as a DPS job and you learn a new skill or spell, you can implement that into the command set you have built, or build a new one from scratch and strategize how you can apply these new skills. With some of the boss characters in Heavensward, you actually can’t fight them using your older skills — they might require you to know new skills that are only available after the level cap has been raised. This will create an opportunity for players to get together with the community to strategize how to beat these monsters. It’s safe to assume that you’ll be experiencing a new gameplay experience with the raising of the level cap.