Hey there ARKaholics! News from the team has just dropped that the initial release date of the Mac and Linux version which was planned for June 25th has been delayed until the 30th of June. They are using this time to make sure they can get the game as optimized as possible for a smoother release.

We can’t wait to see you all in-game on the 30th, get ready for some dino hunting!

Official Release Date for Mac and Linux versions of ARK: Survival Evolved: June 30th, 2015.

Source: http://steamcommunity.com/games/346110/announcements/detail/111810680965778534