While the official release of the console versions of Divinity: Original Sin 2 is later this year, in August, Xbox One players actually get to play the game early. You see, Xbox has an Early Access program much like Steam, called Xbox Game Preview (while PS4 does not).
So, yes, Xbox One players can play Divinity: Original Sin 2, one of the most lauded RPGs of all time, early- the Game Preview version of the game launches on May 16. You will be able to play the first three hours of the game for free no matter what; you can purchase the Game Preview version to unlock the entire first act, which amounts to the first twenty hours of gameplay. In August, the rest of the game unlocks.
At the very least, making the first three hours available for free should get a lot of players to try it out who otherwise may not have. Divinity: Original Sin 2 is available now on PC, with a consoles release following later this year.