Apple today seeded Public beta 2 for iOS 11.3, watchOS 4.3 and tvOS 11.3. All of these betas are now available for download for those who are already testing the software through over-the-air. Those installing iOS 11.3 for the first time will have to install the beta configuration profile and then download the update.
iOS 11.3 brings a bunch of new features including 4 new Animoji to iPhone X, Battery Health, Health Record, Business Chat for iMessage, Messages in the Cloud, ARKit 1.5 with support for vertical surfaces and more.
tvOS 11.3 is much more tame, but still adds a handful of improvements, including support for AirPlay 2 and other iOS 11.3-related features, frame rate switching for Apple TV 4, and automatic mode switching for AirPlay video sessions.