Motor Trend went 117 with the C7.
Motor Trend went 127 with the first C6 Z06 test. 10 mph difference is huge. http://www.motortrend.com/roadtests/coupes/112_0510_2006_chevrolet_corvette_z06/viewall.html
My bone stock 2009 Z06 went 11.55 @ 125 mph in the TX heat on a poorly prepped track. They absolutely move out stock.
I'm not saying you or motor trend is lying but I have a hard time believing that a c6z would walk a c7z51 like you'd expect a car that traps 10mph higher would. I guess we'll see soon enough.