Apple has released new beta versions to the developers:
Apple Seeds Second Beta of iOS 12.3 With New TV App to Developers
Apple Seeds Second Beta of macOS Mojave 10.14.5 Update to Developers
Apple Seeds Second Beta of tvOS 12.3 to Developers
Apple Seeds Second Beta of watchOS 5.2.1 to Developers
Apple Seeds Second Beta of iOS 12.3 With New TV App to Developers
Apple Seeds Second Beta of macOS Mojave 10.14.5 Update to Developers
Apple Seeds Second Beta of tvOS 12.3 to Developers
Apple Seeds Second Beta of watchOS 5.2.1 to Developers
Apple Seeds Second Beta of iOS 12.3 With New TV App to Developers
Apple today seeded the second beta of of an upcoming iOS 12.3 update to developers, a week and a half after releasing the first beta and two weeks after the launch of iOS 12.2, an update that introduced Apple News+, new Animoji, and more.Read full article @ Mac Rumors
Registered developers can download the new iOS 12.3 beta from Apple's Developer Center or over-the-air once the proper configuration profile has been installed from the Developer Center.
Apple Seeds Second Beta of macOS Mojave 10.14.5 Update to Developers
Apple today seeded the second beta of an upcoming macOS Mojave 10.14.5 update to developers for testing purposes, a week and a half after launching the first beta and two weeks after the launch of macOS Mojave 10.14.4.Read full article @ Mac Rumors
The new macOS Mojave 10.14.5 beta can be downloaded through the Software Update mechanism in System Preferences after the proper profile has been installed from Apple's Developer Center.
Apple Seeds Second Beta of tvOS 12.3 to Developers
Apple today seeded the second beta of an upcoming tvOS 12.3 update to developers, a week and a half after seeding the first beta and two weeks after releasing tvOS 12.2).Read full article @ Mac Rumors
Designed for the fourth and fifth-generation Apple TV models, the new tvOS 12.2 developer beta can be downloaded onto the Apple TV via a profile that's installed using Xcode.
Apple Seeds Second Beta of watchOS 5.2.1 to Developers
Apple today seeded the second beta of an upcoming watchOS 5.2.1 update to developers, a week and a half after seeding the first beta and almost two weeks after the release of the watchOS 5.2 update, which introduced AirPods 2 support and expanded the ECG feature to Europe.Read full article @ Mac Rumors
Once the proper configuration profile has been installed from the Apple Developer Center, the new watchOS beta can be downloaded through the dedicated Apple Watch app on the iPhone by going to General --> Software update.