PlayerUnknown's Battlegrounds is the latest game to enable cross-play between Xbox One and PlayStation 4.
Cross-play between consoles like this was pretty much unheard of until last year, when Sony caved and allowed it in Fortnite.
With the precedent set, there is now a small but growing number of games which allow full cross-play, such as Dauntless, Rocket League, and Smite.

https://www.gamesindustry.biz/articl...nabled-in-pubg