https://www.gamespot.com/articles/new-pubg-map-beta-key-giveaway/1100-6457856/

We're giving away 6,000 Early Access Keys for you to play PlayerUnknown's Battlegrounds' new map, Codename: Savage on PC. (Entry is open worldwide. Scroll down below to get your key.)

The special early access keys we’ll be providing allow players, regardless of whether they own PUBG or not on PC, to drop into the Savage Closed Experimental Test during this period.