In this month's Motor Trend, they're reporting that the Dodge Challenger is a go and will have an SRT-8 version with the 6.1L, 425 HP Hemi upon it's introduction, probably in 2010. The Shelby Mustang will be good for about 450 HP when it arrives next year.
I don't think having a 450 HP Camaro SS is out of the question.
-RBB