We have just shipped an updated Steam Client to the Preview/Beta channel.
Home Screen
Added a new 'Big Art Mode' option for the home screen. This can be enabled in Settings > Home.
Added Personal Calendar to the Recommended tab on the home screen
Screensavers
Added a new screensaver feature, accessible in Settings > Customization. There are two screensavers available:
The default is a game art slideshow that can be configured to show artwork from recently played games and your recent in-game screenshots.
A retro inspired bouncing logo screensaver
Custom screensavers are also supported. Similar to startup movies, they can be placed in directories at ~/.steam/root/config/uioverrides/screensavers/. You can use the bouncing logo screensaver (in the steamui/screensavers directory) as an example to get started.
General
Added notification about the current user when waking from sleep, if there have been multiple recent users. The notification can be activated to switch users and dismisses immediately on any other input. This notification can be toggled from the Notification Settings.
Added confirmation step to "exit VR" and "switch to desktop mode" power menu actions, and removed it from "sleep".
Added explicit warning text to power menu confirmation dialogs when proceeding will shut down an active game.
Added confirmation dialog/user switching ability when waking from sleep would require kicking an active session elsewhere.
The SteamOS compatibility dialogs will now show in desktop mode when installing games not verified for that HW.
The 'System Report' dialog is now more responsive when displaying and uploading the gathered system report.
Added "Default to Desktop Mode" toggle to System settings.
Fixed a case where Windows games would show as 'Not Compatible' in the library view until a manual Proton version was selected for this app.
Improved download speeds on high latency connections.
The "Select compatibility tool" dropdown is now always visible.
The recommended compatibility tool, or steam runtime for native games, now shows at the top of the list as the "Default" option.
Compatibility tool aliases, e.g. "Proton Stable", can now be selected from this dropdown.
Updated default artwork when an app does not have library or hero artwork.
Reorganized the idle timer settings when on battery and AC power
Pressing the controller's system button will request the TV to switch to the Steam Machine as the active source (the connected TV must support HDMI CEC)
Game Recording
Fixed some cases where playback would jump to an unexpected point in the timeline when reaching the end of a play session or clip
Decreased performance impact of game recording for some D3D12 games on Windows
Steam Input
Improved CPU performance at runtime and in configuration loading
Added information about which configurations are compatible in the configurator browser when using a game that requires Steam Input API
Fixed the controller support widget showing "This game doesn't support controllers" for unreleased games that don't have controller support information yet
Fixed controllers not using the desktop configuration on the desktop UI login window
Added the missing settings for adjusting emulated joystick adaptive centering on trackpad
SteamRT3 Experimental Beta
Fixed the Performance Overlay slider.
Fixed "Add a Non-Steam Game" showing an invalid list of applications.
Fixed the "Run Steam when my computer starts" toggle.
Remote Play
A PIN is no longer required to download an app to a remote device. A PIN is still required to Install and Stream from a remote device.
Adding Download Complete notification for a remote download if you initiated the download on your current device.
In-Game Overlay
Fixed frame rate hitches in D3D11 and D3D12 games when taking screenshots on Windows
Fixed rendering the overlay and using other overlay related features (screenshots, game recording, etc.) in Vulkan games that create multiple windows.