Apple releases the four beta versions for developers of iOS 12.1, watchOS 5.1 and tvOS 12.1 to developers a few minutes and in addition to adding improvements and details such as support the Dual SIM support in iOS 12.1. Something that will serve for the use of double SIM in the iPhone XS, XS Max and iPhone XR.
At the moment, there is no release of the beta version of macOS Mojave, but it is possible to be available soon. In any case, the most outstanding improvements of these new versions are similar in all versions of the different OS, with the new 70 emoji or even with the possibility of making group calls with 32 people at once in FaceTime, among others.
For now, it does not seem that these betas carry too many novelties or changes highlighted in terms of functionality. The solution to the problems of the load in some models of iPhone was already solved in the final version of iOS 12.0.1 and therefore in this new beta for developers, the problem is already been fixed.
The tvOS 12.1 update as always is the one that will bring the least news, focusing everything on the correction of errors and little else. watchOS 5.1 adds new spheres of colors from the previous beta and also adds support for FaceTime calls and of course new emojis when the version is released.