Quite a small update to the Steam Beta recently, but for some Linux gamers using Steam Play Proton it might be a rather helpful one.
The new Library got tweaked a little again, now allowing for Family Sharing of tools, Valve also fixed new categories created in small mode or Big Picture mode not being properly saved when switching to normal mode and recently played but disallowed by Family View games not appearing in the Recent Games shelf when Family View is enabled on startup.
Remote Play Together got a tweak as well, to actually allow it to be used in conjunction with Family Sharing.
Specifically for Linux, the Steam Runtime got a gnutls update "to support Proton". As I understand it, that's one of the packages that people needed up to date to get Halo: The Master Chief Collection working properly with Steam Play Proton on Linux. On top of that, there's been "further improvements to steam-runtime-system-info".
Find the announcement here.