The Z28 was actually supposedly getting the LSA from the Cadillac CTS-V which is supercharged and makes 550hp. As stated, rumor has it that this project has been placed on hold while GM trys to not go under. Fbodfather says it has not been cancelled and to have faith, but a lot of other unnamed sources of unknown reliability claim it is dead.
Start of production is February 16th, 2009. As a basic guide, I've been told that you can goto Ford.com and build a Mustang however you want your Camaro to be. Add $1,000 to whatever price the Mustang comes to, and you will be in a general ballpark of what your Camaro will cost. Around $33,000 for the V8 Camaro.
You can see the colors and other information at
www.chevy.com/camaro