Original Post from Android Developers:
Welcome to your New Home on Android TV
Android TV brings rich app experiences and entertainment to the biggest screen in your house, and with Android O, we’re making it even easier for users to access content from their favorite apps.
We’ve created a new Android TV home screen, which organizes video content into channels and programs in a way that’s familiar to TV viewers. Each Android TV app can publish multiple channels, which are represented as rows of programs on the home screen. Apps add relevant programs on each channel, and update these programs and channels as users access content or when new content is available.
Also, the Google Assistant on Android TV is coming later this year, and will allow users to quickly find and access content using their voice. Because the Assistant is context-aware, it can help users narrow down what content to play. Users will also be able access the Assistant to control playback, even while a video or music is playing. When the Google Assistant comes to Android TV it will launch in the US on Android devices running M, N, and O.
You can get started developing for the new Android TV home screen using the Android O Developer Preview. To get started, visit the Android O Developer Preview site, and try out the Android TV Channels and Programs codelab for a first-hand experience building an Android TV app.