Note: The latest iOS 11.3 beta 5 is already released.
Apple released the third public beta of iOS 11.3. This comes one day after the third developer beta and two weeks after the second public beta.
Members of Apple’s beta testing program will receive the new iOS 11.3 beta update over-the-air after installing the proper certificate on an iOS device.
The third beta of iOS 11.3 and tvOS removes AirPlay 2 functionality which was present in previous betas. This allowed Apple TV to be added to the Home app on an iOS device, and it enabled multi-room audio playback across multiple Apple TVs.
Apple says that iOS 11.3 will be released to the public in the spring.