Apple today released Developer Beta 4 of iOS 10.3.2, macOS 10.12.5 Sierra, watchOS 3.2.2, and tvOS 10.2.1. As the version numbers indicate, there are no new features, and they arrive one week after beta 3.
The iOS 10.3.2 release notes list one new fix for this build, which is that Siri text responses should now be complete. This is in additions to SiriKit car commands and third-party VPN apps now working as expected.
Nothing new is listed for macOS 10.12.5 Sierra, other than a generic statement about how this update improved the stability, compatibility, and security of your Mac. watchOS 3.2.2 has some known issues with Xcode, which were there previously, so it's nothing that should affect an end user.
The new tvOS 10.2.1 build fixes an issue that caused the Apple TV to wake with an AirPlay error. There are no known issues in the build.
If you're looking for something that's a bit more exciting, Apple's Worldwide Developer Conference kicks off on June 5. At the event, the company is likely to announce iOS 11, macOS 10.13, watchOS 4, and tvOS 11.