Apple is releasing Beta 1 (build 19E5209h) of iOS 15.4 on iPhone and iPadOS 15.4 on iPad today. It concerns developers for the moment and arrives 24 hours after the final version of iOS 15.3.
First beta available for iOS 15.4
There is currently no information regarding the new features to be found with the first beta of iOS 15.4. It is possible that Universal Control is in the game. Apple previously said the feature was due to arrive in the spring following several delays. As a reminder, iOS 15.3 brought nothing new, only bug fixes and other improvements.
Apple does not yet say when the final version of iOS 15.4 will be available for everyone to download. An arrival at the end of February or during the month of March is a possibility. Everything will depend on any new features that will be present. It was express with iOS 15.3 (two betas and a release candidate).
If your device is set up to receive developer betas, go to Settings > General > Software Update. You will be able to start the download of beta 1 of iOS 15.4.
At the same time, Apple is releasing the first beta (build 21E5196i) of macOS 12.3 on Mac, the first beta (build 19T5212h) of watchOS 8.5 for Apple Watch, and the first beta (build 19L5409j) of tvOS 15.4 for Apple TV.