The Nexus 7.2 has been reported as having the SlimPort Technology integrated into it's microUSB port continue reading to learn more about the technology.
Analogix Slim Port technology is a cabling solution that allows you to display what's on your phone or tablet on an external monitor or TV and charge or power your device, at the same time, depending on the SlimPort cable's features. A tablet or phone, with a SlimPort microUSB, connects by a cable that supports Analogix's SlimPort technology utilizing a chip embedded in the jack portion of the cable, which is based on DisplayPort technology, allowing connections using HDMI, VGA, or DVI. Since Analogix is an OEM, you won't be buying the cables direct, rather through the Google Store or other vendors.
Note that we will not know the full list of features supported by the Nexus 7.2, through microUSB, until the official release, but if it does include SlimPort technology, we will certainly have expanded display possibilities.
Follow this link to read the entire White Paper on Analogix's SlimPort technology. Here