Android 4.2 is a new flavor of Jelly Bean version that is released by Google recently. It is similar to Android 4.1, but bring up some major new features. One of them is to beam content to TV using a wireless display adapter that connects via HDMI, like iPad's Airplay.
The feature uses an industry-standard Wi-Fi display sharing protocol called Miracast. With Miracast-compatible TV, you are able to stream audio and video to the big screen on your Nexus 7 or 10 for gaming and others. LG has already builded it into all of its 2013 smart TVs and that works well on 4.2.
I will go to try from the N7 to a 50-inch plasma panasonic 3d and see if it works.