The Linux and Mac versions of Batman: Arkham Knight have been cancelled according to an announcement by Warner Brothers on Steam.
Developer Feral Interactive was tasked with making the two ports. However, after the troubled PC release the Linux and Mac versions were put on hold while the PC issues were resolved. Now though, the idea of a Linux and Mac version of the caped crusaders latest outing is nothing more than a statement of their cancellation.
The statement simply reads
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.
The game is currently available for PC via Steam, PlayStation 4 and Xbox One.