Earlier today, Apple released Developer Beta 6 of iOS 10, tvOS 10, and watchOS 3, along with the Public Beta 5 of iOS 10. At the time, Apple Developer hadn't been updated to reflect the new builds, but when it was, it showed macOS 10.12 Sierra Developer Beta 6; however, users reported that the update still wasn't available.
For those that have given up on hitting the Updates button in the Mac App Store, it's time to check again, as the new build of macOS Sierra is finally available. If you're not sure if you already have it, head over to "About This Mac" and make sure that you have build 16A294a.
The release notes don't specifically list any fixes, but there is a long list of notes and known issues. In theory, the list of known issues should be getting short by now, as a sixth Developer Beta isn't too far from a GM seed.
If you're already on the Developer or Public Beta, you can grab today's build by opening up the App Store and going to the Updates tab. If you'd like to sign up for the Public Beta, you can do that right here.