Apple has just seeded the sixth beta of macOS Sierra to developers. This comes only one week after the last update. With this beta we find some minor bug fixes and improvements. Other than that there are no major UI changes. We should be nearing the end of the testing period for macOS Sierra. There are only a few more weeks until it launches and not many more betas.
To get the latest beta, users can go to the Mac App Store and get it from there. If you don’t have it yet, you can download it from the developer center downloads page.