The Nexus 7 seven is already one of the best small tablets you can buy and it appears Asus included a smart cover sensor that isn't even listed in the specifications or features. It is reasonable to believe that Asus is planning to build smart covers for the device given they have for some of their other tablets. If not now that this is out it will likely lead to other case manufacturers making use of the little magnetic sensor found buy a guy running a magnet around the edge of his tablet. There is video evidence of this below. Check it out.
[source wwscogin via AndroidPolice]