Along with a new Dev Channel build, Microsoft today released a pair of Beta Channel builds: 22621.575 for the "new features off by default" bucket, and 22622.575 for the "new features may or may not show up for you" bucket.
As a reminder, Insiders who landed in the group with new features turned off by default (Build 22621.xxxx) can check for updates and choose to install the update that will have features rolling out (Build 22622.xxx).
If you're lucky enough to have new features roll out to you once you've installed 22622.575, there's one new change/improvement: in File Explorer, middle clicking a folder with your mouse will open it in a new tab, "like clicking a folder in the body of File Explorer already does."
22622.575 also gets a list of fixes, including fixing an issue where launching File Explorer in Dark Mode ends up in Light Mode, or the right/left arrows launching in light mode, problems with using F11 to expand File Explorer to full screen mode, some drag and drop issues and divider overlapping issues in the navigation pane, and a translation error with the context (right click) menu. You can check the blog post for the full list.
Meanwhile both flavors of this new Beta Channel build received some fixes along with the ones just for 22622.575, above. These include a fix for a crashing Photos app in Windows 11 Beta channel builds, rolling out in the Microsoft Store, and an update supporting urls of up to 8192 characters.
If you're on the Beta Channel, get to downloading, and check out the blog post for a full list of changes, fixes, and known issues.