https://wccftech.com/apple-releases-watchos-6-2-tvos-13-4-and-macos-10-15-4-beta/

Alongside iOS 13.4 and iPadOS 13.4 beta, Apple has also released watchOS 6.2 beta, tvOS 13.4 beta and macOS 10.15.4 beta for developers.

In a not-so-surprising move, Apple released iOS 13.4 beta and iPadOS 13.4 beta to registered developers a while back. But, to keep its tradition of beta software alive and well, Apple has released beta updates for every other device that it makes too. Which means you can go ahead and download watchOS 6.2 beta, tvOS 13.4 beta and macOS 10.15.4 beta as well.