Earlier this week, Apple seeded the first betas of iOS 10.3, macOS 10.12.4 Sierra, and tvOS 10.2 to developers. Now, the former two builds are being released to Public Beta testers.
iOS 10.3 has the most new features, which tends to be the case for an iOS update. Find my iPhone now has a feature to find your AirPods, there's a Podcasts widget, iCloud calls are now supported on Verizon, there are weather forecasts in Maps, and you'll find a new one-handed keyboard for the iPad. CarPlay saw some changes as well.
macOS 10.12.4 Sierra has a few new features too. Night Shift is now supported, as it has been on iOS for some time. This makes the display colors appear 'warmer', so that it should be easier to sleep after staring at your screen at night. Siri can now check cricket scores, schedules, and player rosters from the Indian Premier League and International Cricket Council, and there's dictation support for Shanghainese.
Of course, there are no Public Beta programs for tvOS or watchOS, but there should be a Developer Beta of watchOS 3.2 coming soon, as Apple has already released some documentation for it. Along with SiriKit, it will include a new Theater Mode that will keep your Apple Watch from lighting up while watching a movie.