Members of Apple's registered developer program were provided a quartet of fresh updates on Monday: the fourth pre-release betas of iOS 9.3, tvOS 9.2, watchOS 2.2, and OS X El Capitan 10.11.4.
All four test builds are now available to download through Software Update or via Apple's official developer portal. They arrive two weeks after the third betas were released.
iOS 9.3 beta 4 is identified as build 13E5214d, watchOS 2.2 beta 4 is 13V5129c, tvOS 9.2 beta 4 is 13Y5210d, and OS X 10.11.4 is 15E49a. A new fourth beta of Xcode, identified as build 7D152p, is also available, as well as Apple Configurator 2.2 beta 4 build 3C36.
iOS 9.3 brings with it a number of new features, notably the sleep-enhancing Night Shift mode. The iPad gains multi-user login for educational customers, while Music, CarPlay, and Health have also received some attention.
AppleInsider also detailed last week how the forthcoming update will allow third-party apps to add music to a user's iCloud Music Library directly from the device, without the need to use iTunes on a Mac or PC.
watchOS 2.2 -- when used in conjunction with iOS 9.3 -- will allow owners to pair multiple Apple Watches to a single iPhone, and brings a new look the Maps app's Glance view.
On the Apple TV, users gain support for Bluetooth keyboards and the ability to group home screen apps into folders. The App Switcher is also improved, and support for iCloud Photo Library has been added along with MapKit availability for developers.
Apple TV will also gain voice dictation support with the forthcoming release of tvOS 9.2.
OS X 10.11.4 includes a handful of new features, like individually encrypted items in Notes, and support for displaying iPhone 6s Live Photos in Messages. It also patches a bug related to opening links on Twitter via Apple's Safari browser.