So I watched the cinematic and there is something I really don't get: Why is Anduin claiming the death of his father was because of Wrathion?
Like yeah, I get that he freed Garrosh, that lead to WoD and the AU Guldan killed Varian on the Broken Shore, but this accusation is just so extremely farfetched. It implies that Wrathion had much more influence in Legion than he actually had and even if Anduin is a little bit influenced by Nzoth, the void or whatever, it does not make any sense to blame Wrathion. With the same logik he could blame Jaina for not intervening at the broken shore (or for the cleansing of Dalaran, which also in some way lead to the broken shore if you really want to find a connection) or Khadgar for the same reason. He could blame his Tauren buddy for retreating on the broken shore or Genn for not protecting his father etc.
Its not like Wrathion can see into the future and is playing transdimensional 4D chess here.