Looks like the camaro will be back for '07 on the Zeta platform. However, all are saying it isn't going to be the machine it once was. There isn't any plan to produce a model to compete with the Cobra. The plaan so far is the Camaro's will be made to fit inbetween the new Mustang GT and the Corvette performance wise (350hp?), with the GTO being the competition for the Cobra. The zeta platform is going to be used for a new Buick with plans to use it later on for the GTO.
So, basically it is looking like this on the performance scale:
Mustang GT (300hp), Camaro(350hp?), GTO(400hp), Corvette(400hp), '07 Charger (425hp), GTO Judge(500hp Z06 motor?), Z06 Corvette (500hp)
The Cobra though can fit in anywhere, it hasn't been anounced yet how it will work between SVT and Shelby. Though the thought is two high performance stangs will be produced. A GT350 and a GT500 both being of the Cobra designation. (It is said the GT 350 will have a street legal version of the cammer motor around 420-440hp, with the GT500 having the 550hp Ford GT motor) A Boss model is possible in place of the Mach too.
edit: forgot about the new 6.1L 425hp Hemi Charger.