SteamOS Status update for Street Fighter V explains when to expect the free SteamOS update for Street Fighter V, as this will not be part of tomorrow's launch of the brawler sequel (thanks PC Gamer). Word is:

Attention Steam users and Street Fighter V players! Our development team is working closely with Valve engineers to bring the full Street Fighter V experience onto the SteamOS platform.

This will be a free update to all Street Fighter V Steam players and will be released this Spring. More news will be shared soon, so stay tuned.