Apple today seeded the second beta of an upcoming macOS Sonoma 14.6 update to developers, with the second software coming two weeks after Apple released the first beta.
Registered developers can opt-in to the beta through the Software Update section of the System Settings app. Note that an Apple ID associated with an Apple Developer account is required to get the beta.
We don't yet know what might be included in macOS Sonoma 14.6, and no new features were discovered in the first beta.
Source: Macrumors