https://wccftech.com/apple-releases-rc-build-of-macos-big-sur-11-1-second-rc-build-of-ios-14-3-to-developers/

Today, Apple has seen fit to release the first release candidate version of macOS Big Sur 11.1 to developers for testing purposes. Apart from this, the company also released the second RC build of iOS 14.3 and iPadOS 14.3 to developers two days after the first version was released. If you're a developer, you can download the latest build from Apple's website right now and check out the new additions for yourself.

If you're interested in trying out the new macOS Big Sur 11.1 RC build on compatible Macs, you can do so through Apple's Developer website. Make sure that you download the appropriate configuration profile from the Apple Developer Center. You can update your Mac to the latest RC build using the Software Update mechanism in System Preferences.