TBH some say it's not Azeroth. "The Diamond King has been made a pawn" and "drown yourself in the circle of stars to find him" kind of suggest that Magni, whom we meet inside that chamber accessed through a portal that sort of looks like a circle within a star, is betrayed by an Old God pretending to be her, or is betraying us. This could all be a way to get us away from Azeroth and to Argus, while the Old Gods invade.
Honestly speaking, 7.3 and 8.0 could be connected in a significant way. Perhaps even to the extent that talking about 7.3 also means you'll talk about the beginning of 8.0.