This is the best summary I could come up with:

Updated the quick access performance menu with descriptions for each setting, including how they affect the system and the expected power/performance/visual quality tradeoffs.

This is really great, because the option names by themselves are not easy for a lot of people to understand, and this should just help make the features more accessible.

Greatly improved performance when using hardware encoding with AMD video cards on Windows

Improve layout and imagery for some of the dialogs that show up when launching VR games.

Clicking on items in the control bar (e.g. a download in progress) will correctly switch to the Steam tab

Known issue: when dismissing a dropdown menu, the steam client may incorrectly start blocking mouse input.

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