There is a Q&A with the DirecTV team including developers this Wednesday. I will not be available but if anyone is its a good time to figure out why they are only supporting Le Eco Android TV devices. We need DirecTV Now on the Shield TV, Mi Box and Sony TVs!
I don't know if you remember that but they will be introducing an Android TV STB with a pre-installed DirecTV NOW app (+ custom launcher I guess), just like Dish and the AirTV. It's beeing built by Technicolor too.
Maybe they are waiting to release it ?