Nexus 7: Most of the information is here

Best Buy Unveils Network Page Early Booking second generation of Nexus 7, including full specification and photos, hours before the announcement of the device
U.S. electronics chain Best Buy Google steals the limelight, revealing the booking page of the new version Nexus 7 several hours before the official announcement of the device. Page does not specify when the device will be launched, but giving its price - $ 230 dollars.
Moreover, the images also revealed the device, as well as its complete specification. New tablet will come with a quad-core processor at Qualcomm's 1.5 Gighhartz, 2 gigabytes of memory, 16 gigabytes of storage, a rear camera with a 5 megapixel sensor and the highlight: 7-inch screen with high resolution, 1900x1200. Thickness of the device is 7.6 millimeters and weighs 317 grams.
The tablet will come with a new version of Android, 4.3, and will most likely be one of the first devices will receive it. Please note that the new version, the same developer event, Google unveiled last May, still retains the name Jelly Bean, and the third is doing it.