Content highlights include the increase of the level cap from 95 to 100, the introduction of the second Hero classDruid of the Nightmare, and new PvP/World PvP content. New additional playable races have been added: Half elves for the Alliance, Half-ogres for the Horde, and Half-orcs that will be available for both factions. New NPC races will be featured in Azeroth and the Emerald Dream.
Opt-ins for the public beta will begin on early 2016.
After the Alliance and Horde battled against N'Zoth, both factions must face another evil that lures in the Emerald Dream. Xavius, the Lord of the Nightmare, has emerged from Nyala Citadel to claim the world of Azeroth as his own. Heroes of the Alliance and Horde gather in the Emerald Dream to make a stand against the malevolent being that dares to declare himself the ruler of Azeroth and the Dream of Creation.
Six new high-level dungeons and three new raid instances, all available in regular and heroic modes (with raids in both 15 - 30 player varieties), as well as four heroic 5 - 10 man revamps of classic dungeons and former raids.
New race/class combinations will be available to all players.
Level cap raised on all main and secondary professions to 975, with many new items, patterns and rewards.
World of Warcraft's second hero class, the Druid of the Nightmare is accessible to players after having a character reach level 55. Once unlocked, the Druid of the Nightmare, starting at level 55, will then complete a series of quests in the Emerald Nightmare to defeat the Druids of the Fang. The story will explain their defection and background.
Players will discover the Emerald Dream with a rich new source of creatures, environments, and lore. New starting, leveling, and high-leveled zones will be available in the expansion.
Emerald Dream will ship three end-game raid dungeons, this time with both 15 and 30-man settings. Once the final boss of each has been defeated, players can set each boss to heroic mode. There will be no PvP-unlocked raid dungeons in the expansion.
Among the many figures confirmed to have major roles in the story of Emerald Dream are:
Xavius, known as the Nightmare Lord is the main antagonist of the expansion.
Liam Greymane was brought back by Xavius and was chosen to become of the one leaders of the Druids of the Nightmare. After breaking his control over the Nightmare lord, he reunites with his family in Gilneas and rejoins the Alliance.
Garrosh Hellscream was brought back by the Nightmare lord and was chosen to become of the one leaders of the Druids of the Nightmare. After breaking his control over the Nightmare lord, he rejoins the Horde and swore to undo the damage that he caused.
Malfurion Stormrage becomes the main antagonist of the expansion. He will lead many heroes and druids to the Emerald Dream to battle the Dark'Aln Cult and put an end to Xavius' plan. He will play a major role in questing and end-game content.