http://wccftech.com/ark-survival-evolved-ps4-xb1-crossplay/

A few days ago Jeremy Stieglitz, director of ARK Survival Evolved, revealed that the development team at Wildcard was interested in the possibility of cross-play with the PlayStation 4 version, even assured that internally they made it work but when dealing with Sony the company rejected it. Recently, Jesse Rapczak, co-founder of Wildcard, the studio responsible for the game, also talked about it.

Wildcard co-founder Jesse Rapczak told Eurogamer that the interest in enabling cross-play in the ARK Survival Evolved PS4 version remains and it’s just a matter of willingness of Sony to participate because, in technical terms, have everything ready for it to happen.