Official info and pics go out December 20. From what I've gathered from the thread listed below the car will weigh a bit more than the current Z06, have brakes the size of a large or extra large pizza.
http://www.digitalcorvettes.com/forums/showthread.php?t=91238&page=16
http://www.digitalcorvettes.com/forums/showthread.php?t=91238&page=16