Starting from today, PlayerUnknown's Battlegrounds has officially left the Game Preview program on Xbox One and is now considered version 1.0. Those who picked up the game in Game Preview will automatically receive the patch which transitions you to the full version, while new players can make their purchase directly from the Microsoft Store.
Like any update, it brings new content with it, starting with the Sanhok map which is smaller than the two already online (and consequently an excellent battlefield for faster matches), as well as new systems and general performance improvements.
Finally, version 1.0 also introduces achievements, some of which are retroactive and will be automatically unlocked if you have met certain requirements. For more details, you can visit Xbox Wire.