Official Production pictures and show models of the ZR1 Corvette were released around Dec '07 Jan '08. The first few test releases (for GM internal testing only) rolled off the line in early June. They are still not available for public sale.
Point is: pictures and show models (nearly identical to factory release) were released within 8 months of hitting the showroom floors. More like 6 months.
Aren't we within that window now?
C'mon GM, THROW US A BONE!!!!
PS- the only reason why I can think we haven't seen more is they may still be doing some final adjustments, one or more of which may be significant.
All this being said, I'd bet we will get some "good stuff" within the next month or so. (assuming something "leaks" before the Indy unveiling)