Capcom are making a big deal of supporting the PC from the outset with Street Fighter 5, and on their blog this morning they announced that there's another platform besides the PC and consoles that they'll be coming to.
"I'm excited to announce that Street Fighter V will be officially supporting Steam OS! We are working closely with Valve on this endeavour, and will have more details to announce in the near future, so stay tuned for updates," Capcom said.
The company added that support for the Steam controller would be available from launch. You'll even be able to test SF5 out with Valve's gamepad in the next beta phase, which kicks off later tonight and runs throughout the weekend.