Apple has released the third beta version of iOS 12.4 for users registered in the software beta test program iOS.
In iOS 12.4, no major new features or changes are expected, suggesting that the beta version is likely to focus on fixing bugs and minor improvements in the iPhone and iPad operating systems.
Appropriate iPhone and iPad devices can download the latest version of iOS 12.4 beta 3 from the software update mechanism in iOS settings.
In addition, Apple also released watchOS 5.3 beta 2 and tvOS 12.4 beta 2. These beta updates can be downloaded to registered devices using the appropriate settings applications.
MacOS Mojave 10.15.6 beta 2 has not yet been released, but probably another beta will be released soon.
Apple usually runs a lot of beta versions before releasing the final stable build for the general public.
The latest available stable builds of system software for Apple products are currently iOS 12.3.1 for iPhone and iPad, MacOS Mojave 10.14.5 for Mac, watchOS 5.2.1 for Apple Watch and tvOS 12.3 for Apple TV.
Apple is expected to introduce iOS 13 and MacOS 10.15 to the general public at the annual WWDC 2019 conference in California, which will begin next week.