If you're waiting for the Year of the Linux Desktop to begin, take a deep breath and cross your fingers. Valve said yesterday that "Things have been going well" for its Steam Linux client, so it plans to launch an internal beta next week then an invite-only external beta for 1,000 Linuxnauts in October.
Valve's Linux team explains that the beta will support Ubuntu 12.04 and above, offering Steam and one unspecified Valve game. That may be Left 4 Dead 2, as it was the testbed game for Source on Linux, but who knows, it could be a surprise.
It won't, however, include Big Picture mode or any other Valve games.
Keep your eyes peeled for signups, though Valve's ideally looking for seasoned Linux users.