Yesterday we communicated it at the time that the official version of macOS Sierra 10.12.5 was launched for all Mac users, macOS Sierra 1 beta 10.12.6 is now available to developers. In this case, the new version for Mac developers like the previous beta for developers does not add the changes it brings, but we imagine that it is about finishing polishing the version in performance, stability and security. This week Apple has released updates and it does so for all the OS it has available, both the final versions of yesterday and the first betas of today.
We are clear that this version 10.12.6 will be the last available version of macOS Sierra if there is nothing strange, since in just two weeks we will have the WWDC keynote where it will be taught and the first beta versions of the following Apple OS will be launched , so in principle if there are no important changes or failures to solve, we are facing what will be the latest version of macOS Sierra with almost total security leaving behind the first of the versions called macOS at this time.
As always, it is better to stay out of these beta versions if you are not a developer, since we could have some incompatibility problem with the applications or work tools that we use on the computer. The beta versions released are usually stable and with few bugs that affect functionality but we must not forget that they are beta versions and it is better to be cautious with them.