Last Friday, we discussed reports of Steam having secretly made some updates regarding Steam Play, and hints that it could be linked to allowing for those on Linux to run Windows-only games. As of August 21st, Steam has put out a press release announcing the new beta. Multiple games that don't have an official Linux release can now easily be installed from the Steam client, allowing for easy access to the compatible games, listed below.
Games that originally relied on DirectX will now run through Vulkan, instead. These titles function by running a modified version of WINE, which Valve has dubbed "Proton". For those interested, you can see it on GitHub, where the code has been made open source.