World of Warcraft - Battle for Azeroth - Embers of War Trailer

“Battle for Azeroth is a definitive chapter in the Horde and Alliance conflict at the heart of Warcraft, and it’s been thrilling to see players representing their factions in record numbers and embarking on their war campaigns—not to mention joining in ourselves,” said Mike Morhaime, CEO and cofounder of Blizzard Entertainment. “But the launch is just the beginning of this conflict. More epic content is coming to World of Warcraft in the weeks ahead, and we can’t wait for players to experience the full story as it unfolds over the course of the expansion.”
http://www.worldofwarcraft.com/battle-for-azeroth