This is the best summary I could come up with:
One of the interesting tweaks is that Valve adjusted the CSS to "reduce feature leaks", I guess they're growing a little tired of certain people scraping it constantly to see what they're working on.
Fixed issue loading and saving the app achievement cache file which in some cases caused excessive.
When activating this, the camera will turn to face the direction you are pushing on the Left Stick (default - Track pads, DPads and Buttons can also be used).
Added an option to allow the FlickStick to trigger a Flick Turn if the stick is thrown when the action set/action layer/mode shift is activate.
The computer receiving the stream must have Enhanced 1080p or 4K enabled in the Steam Remote Play advanced client settings.
Fixed a case where the store tab would fail to display any content after maximizing the steam window.
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