Just a day after releasing iOS 12.3 to developers, Apple has now seeded the first beta build of the release to public beta testers. For those who have a device registered in the Apple Beta Program, you can now download the first beta via Settings>General>Software Updates.
The big news is that this build contains the new look UI which eventually will be where we see Apple TV+ when it is released in the Fall. For now, you can see all of the new categories as well as the new flow of the UI.
Apple committed during the “It’s Show Time” event on Monday that the new UI would appear in May of this year on iPhone, iPad, and on Apple TV. That also gives us a good indicator of when we can expect to see iOS 12.3 actually released. If May is the target, you can expect four to six beta builds to land before the public actually gets the new interface.