iOS 12.1 beta 1 is available for public beta testers

Apple has provided public beta versions of iOS 12.1  for testing, just two days after it released the first developer builds in the new testing cycle, with the iOS beta returning Group FaceTime to public testing.

Beta testers who have signed up for Apple’s beta testing program will receive the iOS 12 beta update over-the-air after installing the proper certificate on an iOS device.

Main Features:

Group FaceTime: Apple removed this iOS 12 feature from the iOS 12 beta back in August, and promised it would come in an update to iOS 12 later this year. Early reports indicate that it’s back in the 12.1 beta, but that doesn’t mean it is going to be part of iOS 12.1 when released to the public—Apple may simply be getting it back out there for additional testing.
Hints about new iPads: iOS 12.1 includes code hints for Face ID support in landscape orientation, presumably for upcoming iPad Pros. Also, the Xcode Simulator for iOS 12.1 supports output resolutions up to 3,840×2160 (4K), which suggests that maybe the rumors of a USB-C connector on the new iPad Pros, with support for 4K external monitors, is true.
Measure app improvements: Some early testers are reporting that the Measure app is a bit faster and more accurate in iOS 12.1.