Apple has released new beta versions of iOS 9.3, WatchOS 2.2, and OS X 10.11.4:

Apple Seeds Sixth Beta of iOS 9.3 to Developers and Public Beta Testers
Apple Seeds Sixth Beta of WatchOS 2.2 to Developers
Apple Seeds Sixth OS X 10.11.4 El Capitan Beta to Developers and Public Beta Testers

Apple Seeds Sixth Beta of iOS 9.3 to Developers and Public Beta Testers

As a major update to the iOS 9 operating system, iOS 9.3 introduces several new features. There's a Night Shift mode to reduce the amount of blue light iOS users are exposed to in the evening by shifting the iPad or iPhone display to a warmer (yellower) color spectrum, and there are several features designed to improve the iPad for Education program, such as multi-user login. Multi-user login, while an appealing feature, is limited to MDM customers and is not available to the general public.

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Apple Seeds Sixth Beta of WatchOS 2.2 to Developers

The latest watchOS 2.2 beta can be downloaded through the dedicated Apple Watch app on an iPhone running the iOS 9.3 beta by going to General --> Software update. To install the update, the Apple Watch must have 50 percent battery, it must be placed on the Apple Watch charger, and it must be in range of the iPhone.

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Apple Seeds Sixth OS X 10.11.4 El Capitan Beta to Developers and Public Beta Testers

OS X 10.11.4 offers a couple of new features, such as Live Photos support in Messages, the ability to password protect notes in the Notes app, and an option to import notes from Evernote, but like the recent OS X 10.11.3 update, it appears to focus primarily on under-the-hood bug fixes and performance improvements. Almost all of Apple's OS X updates to date have been smaller updates that improve performance rather than introduce new features.

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