This just in from Dave Salvatore, Corvette Manager Kerbeck Corvette:
"Here's what I was told by GM on this issue. The CFV has very limited supplies so they have decided that the CFV will only be available on the Z07 packages. This will not be listed as a constraint issue but as an order requirement. In fact, if you try to place an order today with the CFV on a non-Z07, the system will not even allow the order to be placed. All orders that were already placed with that option are being changed.
If the supply on this option every becomes more plentiful, GM may re-look at the situation and change it, but based on the fact that after a year and a half on the Stingray the Exposed Carbon Fiber top and Exposed Carbon Fiber interior trim are still heavily constrained I wouldn't plan on it any time soon."