Yesterday Warner Bros. announced that they were suspending sales of Batman Arkham Knight for PC until all of the performance issues were resolved. We now it looks like these issues won’t be resolved until Fall. On the Steam Page for the game it states Batman: Arkham Knight will be available on SteamOS, Linux and Mac in Fall 2015.
So if you were looking at checking out the game and you didn’t originally purchase it you will have to wait till around Fall. If you did buy the game and have not refunded it on Steam you can look forward to PC Patch coming soon. We are not sure when this will happen, but we expect Rockysteady to be working on fixing the issues and releasing patches to gamers who have the PC version of the game.