http://wow.joystiq.com/2014/02/21/warlo ... ing-spoil/
And all of this by the end of the 1st questing zone. Looks like they've outdone themselves with questing plot progression again... (/drolls remembering Jade Forest).Ner'zhul uses an evil force, the Terror of the Void. At the end of the zone, you fight Ner'zhul. He manages to turn a Naaru into "Dark Naaru" form. To purify the Naaru, Velen must sacrifice himself. He dies. This is a huge twist. Note that his death will be staged through a cinematic (end quest).
I can't wait to hear about the rest of the zones, especially Arakk - but that's just my personal love for the burdies.