The Level 80 Job Quests are very short, and generally consist of you telling old NPCs from the previous questline about The First and the relevant Role Quest line... Kind of a small epilogue more than anything.

But anyways, I have heard they supposedly will keep the role quests and I do very much hope do it rather than Job Quests for 80-90, since that way they can get away with doing less quests so they can spend more time on each of them.
Even with possibly Ranged and Melee Physical getting split, it's 5 quest lines instead of the 20 they'd need to do for every class...