Today, Apple seeded a new round of betas to both developers and Public Beta testers. Unfortunately for many, it's not a new build of iOS 11; instead, there are new builds of iOS 10.3.3, macOS 10.12.6 Sierra, and tvOS 10.2.2 available. Of course, only the former two are in the Public Beta program, as there hasn't been one for tvOS until tvOS 11.
As is indicated by the version numbers, none of these updates will include any new front-facing features. In fact, the macOS 10.12.6 beta 6 release notes don't say anything specific to the build, while iOS 10.3.3 beta 6 includes the same old notes and known issues related to managed and shared devices, openURL, SOS, and WebKit.
There's no changelog for tvOS 10.2.2 beta 5, as the link in Apple Developer goes to the release notes for beta 4. That build, however, had no known issues, so it seems likely that beta 5 would be the same. The update will include bug fixes and security improvements for the OS.
Apple seems to be releasing these builds weekly at this point, and general availability seems imminent.
Update: tvOS 10.2.2 beta 5 has been removed from Apple Developer.
Update: It's back, and this time with proper release notes, which still show no known issues.