“Six seats at the high table. Six mouths that hunger one to consume all others.”
I ultimately think she’ll be part of final boss of the expansion as Gul’dan was with WoD and this time we’ll lose azeroth after she uses whatever is left of Nzoths powerbase and the three artifacts plus the heart of azeroth and consume the titan to become a Void Titan. She is probably the shadow that Anduin referred to on the Exodar. I also think Sylvanas will save N’Zoth partially by using the dagger to save him.