Apple released the second Developer Beta builds of its latest bug fix updates for all of its operating systems, including iOS 10.3.3, macOS 10.12.6 Sierra, watchOS 3.2.3, and tvOS 10.2.2. As the version numbers indicate, there are no new front-facing features.
There isn't much additional information in the release notes either. The "notes and known issues" section for iOS hasn't changed in months, still citing areas such as managed and shared devices, openURL, SOS, and WebKit.
The macOS 10.12.6 release notes say nothing that relates to the actual update, which is normal. watchOS 3.2.3 beta 2 includes an issue with Xcode, so it's nothing that would affect the end user. Finally, for tvOS 10.2.2, there are no known issues, and the update will include bug fixes and security improvements.
But if you're interested in what's coming next for Apple's software, the real news will come next week from WWDC 2017, where the company will likely announce iOS 11, macOS 10.13, watchOS 4, and tvOS 11. You'll be able to watch the livestream on June 5, and following the keynote, the firm will release Developer Beta builds for everything that it announces.