Folks have been asking about our early Linux efforts and support for Valve’s SteamOS and Steam Machines. We have good news for you! The 4.1 source code has initial support for running and packaging games for Linux and SteamOS. We love Linux!
Read the full thing at http://www.gamingonlinux.com/articles/epic-games-loves-linux-unreal-engine-41-update-preview-with-linux-support.3412/