With those 15.5" carbon-ceramic brakes, this is a Z07. In fact, it is the same yellow Z06/Z07 that was at NAIAS, just photoshopped black. Same identical background (comparative brake size display for Z-51, Z06 stage 1 & 2 brakes in the middle, with the Z07's carbon-ceramic brakes as the top set). Standing next to the yellow Z06 at NAIAS, took this comparative brake size pic.
As friend of mine got a track test ride in a C6 Z06 with the Z07 package, with one of the Corvette development test drivers. He said it was "scary fast, scary wonderful." Next day, when getting dressed, he noticed a diagonal bruise across his chest from the seat belt. Those brakes mean business.