Apple introduced the third beta version of iOS 12

The next third update of iOS 12 focuses on increasing the performance and fixing the errors found, so you should not expect any global updates from it. Beta is already available for download, but before the main assembly of the operating system appears, its use on a mobile device is not recommended.
Note that in the current beta version, Memoji has been refined, the number of iMessage stickers has been increased, some of the system icons have undergone minor changes.
The release of a stable operating system is likely to take place simultaneously with the appearance of new iPhone smartphones in September.