Apple has release the second beta of the upcoming iOS 12.1.1. The release came to both registered developers as well as public beta testers registered in the Apple Beta Program. If your iPhone or iPad are registered in the program, you should have the update waiting for you under Settings>General>Software Updates.
iOS 12.1.1 is considered a maintenance release and brings virtually no new features. The update focuses on bugs, security, and performance improvements for the platform. The only new feature or change of note is the reworked bottom bar in FaceTime. This now includes quick access buttons for muting a call or changing cameras.
The release of the second beta of iOS 12.1.1 comes a week after the first beta was released. There will be more beta builds, most likely another three to six, before it is released to the public. The translation: Expect this to be released sometime in mid-December. Apple has been very consistent in getting both major and minor update beta builds out to testers. This really began in earnest with iOS 10 and continues through to today.
If you would like to register in the Apple Beta Program, it is free to do so. Just go to the Beta Program site, sign in with your Apple ID, and register your eligible devices. As always, it is recommended that you not run beta builds on your production devices. The hint is in the name, Beta. It could run into a bug that impacts your day-to-day use of your iPhone or iPad.