Some of Apple's new operating systems are already among us, such as iOS 13 and watchOS 6, iPadOS 13 (.1) and tvOS 13 will be coming soon.
Well That said, Apple today released to developers the macOS Catalina 10.15 beta 9 (build 19A573a) is the first beta version of watchOS 6.1 (175054e).
Apple has not yet commented when the macOS Catalina will be made available to the public, merely saying that the system will be released in October.
With respect to watchOS 6.1, as we are still facing the first test release, a lot of water should still roll through until it is released.
Very soon, Ma will release this trial version of macOS 10.15 in the Apple Beta Software Program.