Although Batman: Arkham Knight was scheduled to be released in Spring 2016 on Mac and Linux devices in collaboration with Feral Interactive, Warner Bros. has announced that the latest installment in the Batman franchise will not be launching on those platforms after all. However, those who did pre-order the game will be offered refunds.
According to Warner Bros. "We are very sorry to confirm that Batman: Arkham Knight will no longer be coming to Mac and Linux. If you have pre-ordered Batman: Arkham Knight for Mac or Linux, please apply for a refund via Steam".
Players who pre-ordered the Batman: Arkham Knight Mac or Linux editions can now apply for a refund through Steam.
Steam