Monday evening, Apple has made available to developers and registered users of its firmware testing program iOS 10.3 beta 6 for all compatible iPhone, iPad and iPod Touch. It arrived only five days after the fifth beta, and has build number 14E5273a. The sixth beta of iOS 10.3 can be retrieved from Settings> General> Software update. No new features have been spotted by the developers.
Subsequently, the Cupertino company released macOS 10.12.4 beta 6 for developers and testers. This update has build number 16E189a, and can be downloaded from the tab. Updates from the Mac App Store if you installed beta 5.
Apple released for developers tvOS 10.2 beta 6 (build 14W5264a) and watchOS 3.2 beta 6 (build 14V5245a) yesterday. These two pre-releases can be found in the settings of the Apple TV 4 and the native Apple Watch application of iOS respectively.