While there may be smart TVs from Samsung and LG, it seems that Google hasn't dominated the Smart TV market. What's helping Google though is the fact that certain third-party manufacturers have been manufacturing their Android TV boxes which allow you to hook them up to the TV. There may be USB keyboard and mouse of course but then, they don't seem to function well as a real Android TV or perhaps the answer to Apple TV.
The real Android TV is the fact that it's a Smart TV device powered by Android that will allow you to watch TV content, movies, listen to music, view pictures and so on. Also, this upcoming Nexus TV will have strong gaming features that allow you to play with the customized touchscreen controller and be released in the first half of next year.