Put in the spoiler for those who haven't started the 2nd part of Legendary quest from Pandaria, Horde side.
This movie confirms one thing, we will definetly see Sylvannas act during this expansion.
So the question to the crowd today, as Wrathion stated:
What IS the Horde?
Is it an instrument of vengeance, hellbent to carve out a future for its people? (which Garrosh is trying to accomplish through his all-out war)
Is it a refuge for those who need shelter, a commonwealth of the downtrodden, built for mutual support? (what Thrall started and now returns to make sure it stays that way)
Or is it an alliance of convenience, a confederacy of unlikely partners free to pursue their own agendas? (as the Dark Lady lets the main forces of both side clash, she schemes in the background for a greater plan)
What is the SOUL of the Horde?