Apple released the new beta 10 of iOS 12, the final version is coming in September for iPhone and iPad.
This iOS 12 beta 10 is currently only available to developers but comes at the same time with the new public beta 8, which essentially contains the same features.
As of now, you can download the new iOS 12 beta firmware through Apple developer website or OTA (over-the-air) whether you are a developer enrolled in the Apple Beta Software Program site. for developers or public testers.
New features are not currently available and given the reduced weight of the update (only 68MB on iPhone X) it is assumed that Apple is just filing the final details in view of the release of the final version expected in a few weeks, with the introduction of only bugfixes and improvements to operating system performance.