Sid Meier's Civilization: Beyond Earth is coming to Mac and Linux this holiday, according to a tweet from the official 2K Twitter account.
The PC version of the game is due out Oct. 24. The Mac and Linux versions don't have a specific date, just that the Mac version will be launching on Steam and the Mac App Store sometime this holiday season. The Mac version will hit first, followed by the Linux version. They will sell for $49.99.
The versions will retain the same features and gameplay as the Windows PC version, while also offering cross-platform multiplayer via Steam. The game will also support syncing game saves between Windows PC, Mac and Linux, but saves will have to be transferred by physical media, like a thumb drive.
There are plans to include Steam Workshop support, but that feature will likely not be available at the time of launch.
Mac and Linux users can pre-order a Steam code for the title on Aspyr's online store; all pre-orders will include the Exoplanets Map Pack as a free bonus.
It's worth noting that the Mac App Store version of the game will not support online multiplayer modes. It also will not have any way to access the free DLC, at least at launch.
You can see the system requirements for both versions here.
Update: Updated the story to reflect new details from the press release.