Nothing of much note in this update I'm afraid. Apple Silicon is now detected correctly if running in a VM on an M1 Mac, there have been some tweaks to version detection (so 21H1 isn't recognised as 20H2, and vNext should only appear on legacy Insider builds), and a few other bugs have been fixed.
Furthermore, a hidden "Debug" tab has been added. There's nothing particularly useful for you people in there but you can access it by holding F1 and clicking the Windows logo. Note that if you use any of the settings in there and everything catches fire then I'm not being held responsible (seriously, they're intended for me and not you).
Lastly, logs are now generated at %localappdata%/winver.log so if you're filing an issue it's probably beneficial for you to include that.