On earlier this week, Apple has released several updates such as iOS v11.4 beta 1, tvOS v11.4 and watchOS v4.3.1. iOS 11.4 beta comes out as AirPlay 2. It allows you to stream dropouts free audio video content with multiple supports as Apple Home Pods. AirPlay 2 also supports for both the 4th and 5th (4K) Generation Apple tvs. And watchOS 4.3.1 has fixed bugs of Apple watches.
If you want to check these beta update out as a developer then go to developer.apple.com page. You can visit the page with the membership enrolment page or directly. Access developer.apple.com/programs/ and read all the terms and conditions of enrolling as an individual or as an organisation. Then, click on start enrollment. After that, log in with your Apple ID and password and fill your details up, then, click on continue button. After all the processing, you’ll get a confirmation mail about that. Then you can enjoy the updating features.