Following its official release of iOS 12.1.1, watchOS 5.1.2, macOS 10.14.2, and tvOS 12.1.1, Apple has seeded the first developer update of iOS 12.1.2, watchOS 5.1.3, macOS 10.14.3, and tvOS 12.1.2. Developers who Registered through Apple Developer Center can download the update via OTA.
The release notes for these upcoming updates only highlight bug fixes and performance improvements, however, we expect to fix an issue that bother many users, in which they found that the iPhone failed to connect to cellular network after updating the iOS 12.1.1, and affecting some app, it's understood that the problem already known by Apple engineers, so iOS 12.1.2 is likely to fix that bug.
Asides from that, no major changes or features being discovered at the moment, if we found anything new, we will update the post right way. We will be also pleased if you comment down below your findings.