In tandem with a new beta of OS X 10.11.4, Apple on Tuesday released fifth betas of iOS 9.3, tvOS 9.2, and watchOS 2.2, with the iOS 9.3 code including a version for public beta testers.
The iOS 9.3 beta is identified as build 13E5225a, and for developers is available through iOS' Software Update feature, or alternately Apple's developer portal. Public testers must be registered with the Apple Beta Software Program, and should be able to download it through that website, or else Software Update if they're already beta participants.
iOS 9.3 will add a number of features, such as a Night Shift mode, secure Notes, and extra 3D Touch shortcuts. It will also implement a number fo features aimed at schools and enterprise, such as a Classroom app for teachers and more control over apps and home screens. The new beta should restore full Apple Pencil functionality on the iPad Pro.
Little is known so far about the latest tvOS and watchOS betas, aside from their build numbers, which are up to 13Y5220c and 13V5141a respectively. Previous tvOS 9.2 betas have included changes like folders, a new app switcher, voice dictation, and support for MapKit, Bluetooth keyboards, and iCloud Photo Library.
watchOS 2.2's featurelist includes an overhauled Maps app, plus support for pairing multiple Apple Watches to a single iPhone.