I'm taking a "wait and see attitude."
I will only buy a 2008 Challenger if I can get it for under MSRP (unlikely). If I can't, I will wait for the 2009. Some advantages of waiting are: better price, more options, 6.4 SRT, no first year "bugs," possible 'Cuda, etc.
As a comparison, this is what happened with the SRT Charger in 2006. Very high prices, many first year bugs (e.g., transmission O ring, brake scoring, coolant gunk, leaking sunroofs, etc). In 2007, most of these problems have been corrected and some discount dealers are selling them for invoice. Also Dodge is offering $3,500 rebates.