Just encase anyone missed it over on either mmo champ or the blue post on the forums.
Tuesday, August 30- When Legion is live, dungeons will immediately be available on Normal and Heroic difficulties. Mythic dungeon difficulty will be available after the weekly dungeon reset time.
Tuesday, September 20– The Emerald Nightmare Raid dungeon opens on Normal and Heroic difficulties. Mythic Keystones will begin dropping which will allow increased challenge and rewards from Mythic dungeons.
Tuesday, September 27– Mythic difficulty for the Emerald Nightmare Raid dungeon opens. The first wing of Raid Finder difficulty for Emerald Nightmare opens.
Tuesday, October 11– Raid Finder Wing 2 of Emerald Nightmare opens.
Tuesday, October 25– Raid Finder Wing 3 of Emerald Nightmare opens.