Apple has released new beta versions to the developers:
Apple Seeds Third Beta of iOS 12.3 With New TV App to Developers
Apple Seeds Third Beta of macOS Mojave 10.14.5 Update to Developers
Apple Seeds Third Beta of tvOS 12.3 to Developers
Apple Seeds Third Beta of watchOS 5.2.1 to Developers
Apple Seeds Third Beta of iOS 12.3 With New TV App to Developers
Apple Seeds Third Beta of macOS Mojave 10.14.5 Update to Developers
Apple Seeds Third Beta of tvOS 12.3 to Developers
Apple Seeds Third Beta of watchOS 5.2.1 to Developers
Apple Seeds Third Beta of iOS 12.3 With New TV App to Developers
Apple today seeded the third beta of an upcoming iOS 12.3 update to developers, two weeks after releasing the second beta and a month 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 Third Beta of macOS Mojave 10.14.5 Update to Developers
Apple today seeded the third beta of an upcoming macOS Mojave 10.14.5 update to developers for testing purposes, two weeks after launching the second beta and a month 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 Third Beta of tvOS 12.3 to Developers
Apple today seeded the third beta of an upcoming tvOS 12.3 update to developers, two weeks seeding the second beta and three weeks after releasing tvOS 12.2).Read full article @ Mac Rumors
Designed for the fourth and fifth-generation Apple TV models, the new tvOS 12.3 developer beta can be downloaded onto the Apple TV via a profile that's installed using Xcode. There's also a new second beta software update for the third-generation Apple TV model.
Apple Seeds Third Beta of watchOS 5.2.1 to Developers
Apple today seeded the third beta of an upcoming watchOS 5.2.1 update to developers, two weeks after seeding the second beta and almost a month 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.