Apple has released the first public betas of iOS 9.3 and OS X 10.11.4. Corresponding developer betas were released earlier this week. They’re available to those registered in Apple’s Beta Software Program (https://beta.apple.com/sp/betaprogram/).
The first beta of iOS 9.3 adds: new features for the Health, Wallet, Notes, and Settings apps; the ability for students to share iPads; an enhanced Managed Apple ID function; and new 3D Touch shortcuts. It also adds a new feature called Night Shift, which is is designed to cut down on the amount of blue light an iOS device is putting out during the evening hours.
Mac OS X El Capitan 10.11.4 beta (and the Server version) are the fourth updates to the El Capitan OS. We can find no notes on what the updates entail.