https://www.polygon.com/2018/6/15/17469336/world-of-warcraft-classic-patch-1-12-drums-of-war

Blizzard announced today that World of Warcraft Classic will be set in patch 1.12: Drums of War. In a developer update, Blizzard said it chose patch 1.12 “because it represents the most complete version of the classic experience.”

Players have been debating for months — since the reveal of World of Warcraft Classic last BlizzCon — about what “Classic” truly means. Is it 1.1? Is it the final patch of “vanilla WoW?” What is the true World of Warcraft experience for old-school players? With the announcement today, Blizzard has answered that question.