Sources are under NDA, but here is basics of new Expac.
Title: Azeroth:A New Future (also unconfirmed) may be from early iterations
New Class: Chronomancer
2 specs- unconfirmed 1 DPS 1Healer
new spell types, similar to drains, that are then hasted by the Chronomancers time abilities. Very supportive class, especially in the healer role, can slow down damage, pause it for small windows, and turn it back. Can also synergize with other healers to haste their heals.
New Zone:
9.2 deals with the Jailer, although he is successful in part. In order to unmake the universe, he uses Zereth Mortis to make time flow backward. Being present in the zone and raid means that we and the other heroes from Horde and Alliance aren't effected. We are able to stop him and shut down the powers he controlled, but not before he succeeded, to a degree, time in all places of existence reversed, and exiting the shadowlands we come to find that the world is completely different, we are back before the explosion of the well of eternity (exact time unknown) We are back to azeroth, but must find our future. the only ones who know what happened are us, as well as the NPC's that were with us in Zereth Mortis, and the bronze dragon flight, they are the ones to train us in chronomancy.