After the fourth beta version of macOS 10.15 Apple gave developers the ability to test the fourth test build of iOS 13 and tvOS 13. The latter became available tonight.
As usual, a new test assemblies cupertinos have focused primarily on eliminating errors and improving the stability of operating systems. IOS 13 beta 4 Apple has improved the 3D Touch on some iPhone models has fixed sensor display, redesigned individual badges and made some interface changes. As for major changes, while developers have not found them.
At this stage, the users who has already set a new test build, note that bugs and flaws in the systems lacking. Many complain of unstable operation of third-party applications, problems with the updates already installed programs, low autonomy, etc.