I would safely say the Z/28 was tested in a wind tunnel, they would not go through the front and rear design changes the way they just for funsies or on a whim. The ZL1 was extensively tested in a wind tunnel, the tailight changes have not been disclosed, nor the shape or design of the rear fascia, decklid, spoiler, lower aero panel and rear diffuser. The rear would reflect the style refresh of the 2014 is all they said. Lets wait and see before anyone passes harsh judgement. Let's not jump the gun.
In Scott We Trust...all others must show proof.