For me I did not run out of quests to do until I was level 46. Then I just did some FATE's till 49 where I could pick up the main story to which if you follow, there are a heaps of new quests at the Scions main base. I easily hit 50 and only had 3 levels where I needed to do some FATE's. If you are leveling a second toon such as myself then, I feel your pain.

As for new jobs/classes, I'd really like to see them asap but, I think SE has bigger fish to fry atm. The game is new, they can't just spew out heaps of new content asap