One of the tendencies that I have noted in multiple apps are live tiles.
For example Youtube TV has live tiles for live TV, as you move on the focus, it shows on the selected show tile a live feed in a small window.
Similarly the Netflix Android TV app shows for Netflix movies the poster, and as a specific movie is the focus, it shows the trailer for the movie.
So I imagine a poster view for movies, and as a movie is the focus, that trailer for that movie plays in the actual tile. For TV shows, the live tile could be the TV theme if available. For the on now on Live TV, the actual feed can play.
I do realize that this is be player specific as opposed to the server.