nascar pretty much means nothing...unless they're planning to put the "stock" back in stock car.
It means they're serious about this becoming a long-term production run beyond a few thousand cop cars. It means there will be a performance sedan alternative to BMW, Acura/Lexus, dodge gangsterwannabespecial (er I mean charger), and Taurus SHO, all of which cost more than the chebby SS will cost.
On the dreamer side of things, it means that maybe chebby SS parts (like suspension, wheels, etc) may be alternatives to hard to get spares for my G8.
It means one day a non-descript 4-door chebby SS sleeper grocery getter may eat your lunch at the dragstrip for a lot less money than a similiarly prepped mustang
It also probably means we'll be seeing a return to the days of domination of mustangs and caprices for cop cars. With either of those, who needs any of the more exotic or expensive choices?