1.20
They are currently in the process or reallocating abilities for all 7 classes right now. I could've sworn I read that it was suppose to be out today but it will be soon.

1.20+
Introduce Jobs and balance as well.

I think reallocating skills for 7 classes, introducing 7 new jobs, and balancing them all is quite a monumental task. 1.18 the archers were the preferred class for r45 dungeon and now in 1.19 lancers are preferred class for ifrit. As you can see, SE, although doing a great job, has not perfected the concept of class balance. 7 classes + 7 jobs is going to be hell to balance if they can't quite get 7 classes balanced. Added an 8th or 9th class (DOM) + their respective job would only add to an already difficult balancing act. Let them get what they have right first and that's what they are trying to do.

P.S. This is no way meant to be a bash to SE just that it takes time.

EDIT: This is similar to the introduction of the Death Knight in WOW. It took them vanilla wow + TBC before they introduced one new class with the 2nd expansion (3 or 4 years). Anyone who knows wow will tell you class balance has and never will be perfect.