https://wccftech.com/blizzard-wow-classic-beta-alpha/

WoW Classic Beta testing for employees has begun and more information about World of Warcraft’s Vanilla server option will be released soon.

Last week, a new WoW Classic data build surfaced on Blizzard’s Vendor CDN which suggested that a beta for Classic could be inbound. According to Blizzard however, this new build is related to internal employee alpha testing.