MacRumors published a story that Apple has released the third beta of macOS Big Sur 11.5 to registered developers.
Apple Seeds Third Beta of macOS Big Sur 11.5 to Developers
Apple today seeded the third beta of an upcoming macOS Big Sur 11.5 update to developers for testing purposes, with the new beta coming two weeks after the release of the second macOS Big Sur 11.5 beta. Developers can download the macOS Big Sur 11.5 beta using the Software Update mechanism in System Preferences after installing the proper profile from the Apple Developer Center. macOS Big Sur 11.5 may be a more minor update focusing on under-the-hood performance improvements and bug fixes for issues that weren't able to be addressed in the macOS Big Sur 11.4 update.
