The dealer will know very little and this is no different than any other new release. When the Z06 was released there were countless dealers that never even knew they weren't getting allocations, leaving hundreds of people without their deposit being returned for several months. At the end of the first cycle, GM was pressed to bring in several more Z06's (there were only 28 to Canada originally of which I got one) because of the mismanagement that was. Still, I know a number who were without their $5000 deposit from before Christmas until the following May/June 15.
The ZR-1 is coming. It is part of the GM marketing plan. First we had the Z06, now we have the more track capable Camaro ZL-1 and next the ZR-1 will top that, followed by the 3 versions of the mid-engine. All the while, the Z06 will remain with its current popularity. I have an allocation guaranteed with a large auto group... but pricing will be key. No matter though... 47000km on this Z and just back from the Virginias last weekend, following the Shenandoahs. Love driving it.