If you are a registered developer with Apple Developer account, you can head over to developer.apple.com right now to download the new beta 4 IPSW file of iOS 9.3 for your device. If you are already running a previous beta version of iOS 9.3, simply head to Settings > General > Software Update on the device to grab the update directly using OTA (over-the-air) update method.
Apple hasn’t made available iOS 9.3 beta 4 to members of Public Beta program yet but it’s only a matter of time before they do that. We will update the post whenever iOS 9.3 Public Beta 4 is seeded to public testers.
iOS 9.3 is a major update for a point release. It brings a number of new features to iPhones and iPads, including Night Shift, multi-user login support on iPad for MDM customers, new 3D Touch Quick Actions for some of the stock Apple apps, ability to connect two Apple Watch units to a single iPhone, enhancements to first-party stock apps such as Apple News, Notes and Health, some enhancements to CarPlay, among other things.
As for what’s new in iOS 9.3 beta 4 compared to previous beta 3 version, we are in the process of testing the new seed and as soon as we find the changes, we will add them down as updates in this post.
Update x1: Apple appears to have updated icon for Control Center Night Shift toggle in iOS 9.3 beta 4.
Update x2: As expected, Apple has now made available iOS 9.3 beta 4 to public beta testers.