Citizens! Keep an eye out in your capital cities for Doomsayers and their pamphlets of the incoming legion! Collect them all (Only one per customer though, soulbound once touched) and be on top of what is going on as the legion prepatch gets underway!
I'll post some I've found so far... add to this post if you find anymore!!!
P.S. Don't forget to keep your ears out for their cries of impending doom too!!