Following on from the general release of macOS Sierra 10.12.4, Apple has released a new beta of their desktop software to developers in the form of macOS Sierra 10.12.5 beta 1.
The macOS Sierra 10.12.5 beta is only available for registered developers at the moment, it is also expected to be made available to public beta testers soon.
As yet there are no details on what is new in the macOS Sierra 10.12.5 Beta 1 software update, as soon as we get some more information and details on when the software will be released, we will let you guys know.
Source MacRumors