Valve is reportedly developing a Nintendo Switch-like portable PC that will be based on Linux. Mentions of a new device have been spotted in the code for the latest version of Steam beta. Valve co-founder and Managing Director Gabe Newell had also reportedly hinted at an upcoming console.
References found in the latest Steam client beta indicate Valve is working on something called "Neptune," also known as "SteamPal." We don't know exactly what this is yet, but it appears to be a new kind of hardware possibly a handheld console.