Apple just released the fourth beta of an upcoming macOS High Sierra 10.13.6 update for developers as well as the general public.l so that they can carry out the relevant tests.
The beta is released one week after the third beta of macOS High Sierra 10.13.6 and it so happens that the beta of developers coincide, as for those users signed up to the public beta program. If you have the right profile, you can download the beta from now on and carry out the tests you consider appropriate.
It is too early to know what new features will bring the beta that they have just released. This is probably a beta that focuses on bug fixes and performance improvements that emerged in the current version of macOS High Sierra, 10.13.5. This system is mature enough so that both developers and the general public, they can use it simultaneously.
MacOS High Sierra 10.13.6 is expected to be one of the latest versions of this operating system. Releasing the final version is expected to occur in the coming weeks, always before the month of August. The next major macOS update should be macOS 10.14 Mojave, with the nonsense presented in the last WWDC.
Meanwhile, any news that we discover in macOS High Sierra 10.13.6 will be sent to you on this page, as well as any security update that Apple releases cumulatively, each time it detects a relevant problem in its operating system.