Android TV is Google's latest take on Android for the TV and is released with Android 5.0 Lollipop.
The first device running Android TV is Google's own device Nexus Player.
For more information
http://www.android.com/tv/
http://www.google.com/nexus/player/
https://developer.android.com/tv/index.html
The good thing with Android TV is that it runs regular Android apps with some modifications and it also has built in support for Google Cast.
Updated:
Starting today, you’ll find Spotify on Android TV devices including Sony’s BRAVIA, NVIDIA SHIELD, Philips and the Bbox Miami by Bouygues Telecom. Click here for a complete list of all devices that support Android TV.