Apple has released a second set of developer betas for iOS 12.1, tvOS 12.1, and watchOS 5.1, two weeks after the release of the first set of betas.
Apple has not yet published release notes on the developer downloads page for this round of betas, but recent reports have suggested that the iOS 12.1 will add dual-SIM support for the new 2018 iPhone models, along with Group FaceTime and a collection of new emoji.
A public beta of iOS 12.1 is also available through Apple’s Beta Software Program.