Apple has released the developer release candidates of macOS 12.4, iOS 15.5, iPadOS 15.5, tvOS 15.5, and watchOS 8.6. A release candidate (RC), also known as “going silver”, is a beta version with potential to be a stable product.
Registered developers can download the betas via Apple’s developer portal. Or they can be downloaded over-the-air once the proper configuration profile has been installed from the Developer Center.