macOS Sierra 10.12.1 Beta 3 Released by Apple
Apple has released macOS Sierra 10.12.1 beta 3, the new build arrives as 16B2338c.
The beta update is available now from the Mac App Store for those enrolled in the Developer beta testing program, and presumably will launch soon after for macOS Public Beta testers as well.
The new build of macOS Sierra likely focuses on bug fixes and refinements to the Mac operating system, and hopefully resolves some of the unusual problems discussed here which may impact a small number of Sierra installations.
No new features are expected in Mac OS 10.12.1 but the Photos app will gain a new Portraits album to coincide with the iPhone 7 Plus Portrait mode feature that will debut in iOS 10.1.
Separately, there are rumors that macOS 10.12.1 will debut alongside new MacBook Pro hardware, though that remains purely speculative at the moment.