Valve released a Steam client update to their gaming customers today.
The client update was mentioned this afternoon at SteamPowered.com
The most notable Linux change is updating the runtime to handle the final SDL 2.0 ABI. SDL 2.0 has a whole lot of new features
over SDL 1.2.
There's also more Linux Big Picture Mode work and more. (Pardon for terse postings today and in coming days due to one-handed typing