Apple does not waste time and offers us, just after the final version of iOS 12 (cf. iOS 12 is available in final version for iPhone, iPad and iPod touch), the first beta of iOS 12.1.
It is available for iPhone, iPad and iPod touch and has the build number 16B5059d. Intended for developers at the moment, it can be recovered either by going to Settings> General> Software update or by accessing the Dev Center at this address to retrieve the firmware from iOS 12.1 beta 1 and perform a manual installation via iTunes.
We will communicate the new features of this new pre-release very soon in a dedicated article.