i don´t know if anyone have posted something similar but i think Tyrande is going to die at the end of Legion, i was watching Illidan´s cinematic, and how when he is beaten in the black temple he remembers Cenarius talking about sacrifice and then his final thought is about Tyrande, i think this is foreshadowing that Tyrande is going to die, it will be something like this: Illidan wil be one step away from destroying the legion whether that means he is going to destroy Sargeras or weaken him, or destroy Argus it doesn´t matter, the thing is, he will have to choose about fulfilling his dream or saving Tyrande´s life. the legion´s destruction wil come at the cost of Tyrande´s life, after all, what else could Illidan sacrifice that he hasn´t sacrifice yet, he only cares about Tyrande, the other option is him sacrificing his brother but that would show him as a douche, i think is far more likely that is Tyrande the price he will have to paid in order to destroy the legion.