Apple today has seeded its sixth beta of macOS 10.12.4 beta to developers. This comes about a a week after the last macOS 10.12.4 beta. The new beta includes native Night Shift support on macOS, among other things.
Night Shift can be found under System Preferences > Displays > Night Shift.
macOS 10.12.4 beta 6 is now available for download via Apple’s Developer Center. The beta is currently available for developers only.
It is highly unrecommended to run this beta on your daily driver. However, if you find anything new let us know in the comments below!