I may have missed some leak, which I hope I have because I'm disappointed.
Why is Azshara a simple mid-tier boss? A lore figure, competing with Deathwing and the Lich King, who has in one way or another been teased in nearly every expansion, and even vanilla, becomes just another boss in the way for the ultimate villain.
So we kill her, but not before she manages to release N'zoth, and then what? 14 years of teases flushed down the drain?