The "official release" for PUBG is now out on Xbox One. That means it's officially out of beta! It includes Sanhok, in-game rewards for all existing and new players, and brand new optimizations to boot.
From the press release:
Today PUBG Corp. and Xbox launched the Full Product Release for PLAYERUNKNOWN’S BATTLEGROUNDS (PUBG). Along with the full release comes the addition of the 3rd map, Sanhok, in-game rewards for both existing and new players and a whole host of optimizations designed to give players the best PUBG experience on Xbox One. The announcement was shared on Xbox Wire.