Apple today seeded the fifth beta of macOS Sierra 10.12.4 to developers. We see this build one week after the last one. In this version we get Night Shift. This is a feature that was introduced back in iOS 10.1. What it does is during the night it will change the screen color temperature to a warmer color which is easier on the eyes. Other than that we’re not sure what else is new.
To get this version developers can go to the Mac App Store and find it under software updates. If you aren’t running the beta yet you’ll need to go to the Apple Developer Center and get the installer from there.