Apple distributes third developer betas of iOS 12.3, tvOS 12.3, watchOS 5.2.1, macOS 10.14.5

Apple has reached the third round of developer betas in its current cycle, offering up new builds of iOS 12.3, tvOS 12.3, watchOS 5.2.1, and macOS 10.14.5 up for testing by program participants, as well as a second build for the third-generation Apple TV software version 7.3.