I asked Dr. Z about production numbers and here is the response:
Dear Greg:
Thanks for contacting Dr.Z. Your message has been forwarded to us for
response.
Thank you for your recent email regarding the 2008 Dodge Challenger.
The all-new Dodge Challenger will make its debut as a 2008 model, in the
2008 calendar-year. True to both its historical and modern concept car
roots, the 2008 Dodge Challenger will be offered as a two-door,
HEMI V-8
powered, manual-transmission, and rear-drive coupe. 
DaimlerChrysler has yet to announce the pricing, product specifications
or volume projections for the 2009 Dodge Challenger. More information
should become available to us as well as being posted on Dodge.com
closer to the official release date of the Challenger. We encourage you
to stay in contact with us at Dodge.com and your local Dodge dealership
for future updates.