Valve has launched a new beta version for its Steam for Linux client, bringing a lot of interesting features.
After a development version garners sufficient changes, Valve promotes it to stable. The work for the next beta starts almost immediately.
The latest update to the Steam client is only meant for the Linux version. According to Valve, it fixes a beta regression so the controller guide button brings up the overlay in games again, when the user is in the Big Picture mode.
To gain access to the Beta version of the client, you'll have to go into Settings and change your Beta participation option.
Download the Steam for Linux installer from Softpedia. Keep in mind that this is an update for the Beta version, which means that other bugs might exist. Those bugs will be fixed in the upcoming releases.