So we took down Archimonde in WoD (supposedly). We're going after KJ in Tomb (supposedly going to kill him). So the question begs to be asked: who is leading the eredar on Argus?
My thought: Velen's Wife. From what I remember KJ took his family and we already killed his corrupted son in the Exodar so why not have her be one of the big bads on Argus? It would definitely put an interesting twist on Velen's story.