MacRumors published a story that Apple has released the iOS 14.4 and iPadOS 14.4 release candidate to registered developers and public beta testers.

Apple Seeds iOS 14.4 and iPadOS 14.4 Release Candidate to Developers and Public Beta Testers

Apple today seeded the RC version of upcoming iOS 14.4 and iPadOS 14.4 updates to developers for testing purposes, with the new betas coming a week after Apple released the second betas. iOS 14.4 and iPadOS 14.4 can be downloaded through the Apple Developer Center or over the air after the proper profile has been installed on an iPhone or iPad. 

Apple Seeds iOS 14.4 and iPadOS 14.4 Release Candidate to Developers and Public Beta Testers