Apple has seeded the release candidates of macOS Sonoma 14.5, iOS 17.6, iPadOS 17.6, watchOS 10.6, tvOS 17.6, visionOS 1.3 to developers.
A release candidate (RC), also known as gamma testing or “going silver”, is a beta version with the potential to be a stable product, which is ready to release unless significant bugs emerge.
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.