Shortly after the September presentation, Apple released the third test build of iOS 13.1, pre-release version of iOS 13, and the eighth beta version of macOS Catalina. While these updates are only available to authorized developers.
It should be noted that any changes the new test build does not bring. Golden Master iOS 13 and weighs about 500 MB, carries only the correction of defects and bugs that were found in previous releases. About the new features in a prerelease build of iOS 13 no information.
Similarly situation is with iOS 13.1 Beta 3. In the new test build yet not found any notable innovations. While the third beta version includes only bug fixes and defects.
As for the eighth beta version of macOS Catalina, that is, the assumption that it is cupertinos not only fixed some bugs, but have paid some attention to the stability and security of the operating system.