Apple has released the first release candidate of macOS Sonoma 14.6 to developers for testing. The build number is 23G80. This follows the public release of macOS Sonoma 14.5 in May.
The release notes have yet to propagate, but we'll be posted them as soon as they are available.
Developers with an Apple Silicon Mac can download the macOS 14 restore image from the link below. For devices running macOS 13.4 Ventura or later, go to System Settings > General > Software Update > Beta Updates and choose the Developer beta to install this software.