At BlizzCon, Blizzard announced that Warcraft Classic — the vanilla experience based on the game before any of its expansions — will go live next summer and be included in the standard WoW subscription. Interestingly, the entire sweep of game content will not be available when the game goes live. Instead, players will have access to Molten Core and Onyxia, the two 40-man raids that Blizzard implemented first in the original 2004 title. The company isn’t strictly duplicating the original rollout timeline; Dire Maul, Lord Kazzak, and Azuregos will all be available to kill as well.
Classic WoW is the highly anticipated, upcoming (re) release of the original, first World of Warcraft version, known as Classic and by it's other popular ice-cream like name: Vanilla WoW. Dubbed Retail Classic, or Official Classic by the playerbase - it was finally announced by Blizzard in November 2017, after a lot of pressure from the Private Server World of Warcraft community, since the latter's shutdown of the most popular Private Server called Nostalrius which featured the first WoW version in two separate PvP and PvE servers.