Earlier today, Apple has officially released new update for iOS 12.3. It has been launched and released over 100 countries. This update brings minor changes on functionality, which highlights on Apple TV optimization, AirPlay 2 compatibility and functionality update.
Apple has finally released the Air Play 2 API to other manufacturers so it can integrate into their own TV ecosystem. It is now possible to stream to TV without the use of Apple TV.
There is also an update on Apple TV App which they can open up several subscribed channel (HBO, Showtime, Stars) catered for US consumer.
Apple TV App also brings better optimization on personalized content and more child friendly content.
Besides, Apple also brings macOS 10.14.5, watchOS 5.2.1 and tvOS 12.3 today. Apart from the new rainbow UI, there is nothing much significant on device stability and performance update.