I found the name of the scenario missleading. As a player you find nothing there we didn't already know.
There was a lot of implication, but now things are confirmed. (Granted, there are Dark Shaman in the Barrens/ect, but the problem remains that we don't know at which point in the story it should be done. It's clearly done after "Dark Heart of Pandaria" but other than that, it's up in the air).