https://www.polygon.com/blizzcon/2018/11/2/18055774/world-of-warcraft-classic-demo-launch-date-blizzcon-2018

World of Warcraft: Classic launches in summer 2019, Blizzard announced live on stage at the BlizzCon fan convention. The company also announced that everyone with a subscription to World of Warcraft will have access to Classic.

In August, Blizzard announced details on what to expect from the demo for World of Warcraft: Classic. That demo goes live today, both for attendees of the annual convention and those participating remotely via the BlizzCon Virtual Ticket.