Apple has released beta 2 to developers of its flagship operating systems for iOS 12, tvOS 12, macOS 10.14 and watchOS two weeks after its World Wide Developers Conference (WWDC) where it released the first beta's to developers. It's hard to predict when we'll see a public beta of the various OS's this early in the release cycle. It's more likely that these will appear later in the beta lifecycle as stability increases and Apple lock down features and its UI. As expected, Beta 2 introduces a number of changes and refinements to the features introduced in the beta 1...
Source: https://www.gsmarena.com/apple_releases_beta_2_for_ios_12_tvos_12_macos_1014_and_watchos_5_for_developers-news-31766.php
