https://wccftech.com/apple-releases-beta-2-of-ios-12-1-watchos-5-1-and-tvos-12-1-to-developers/

Today, Apple has seen fit to release the beta 2 of iOS 12.1, watchOS 5.1 and tvOS 12.1 to developers. If you’re a developer, you can now download the second beta for their respective devices. Let’s see some more details on what the new beta build has to offer.

If you’re a registered developer, you can now download the new iOS 12.1 beta 2 on your compatible iPhone or iPad. the new build can be downloaded from the Apple Developer Center or over-the-air. Be sure to install the appropriate configuration profile from the Developer Center.