I posted a couple of times were I saw in the new 2008 car buying guide from Motortrend that the new Challenger would only have a 5.7L hemi and the 6.1L hemi from the SRT-8s.
That means the Challenger will only have 340hp and 425hp respectively. From a 4000lb car that is going to be quick, but not anything mind blowing.
Here is an article that seems to back up my claim.
http://www.planetchallenger.com/conc...er-070821.html
That means that the possible LS3 Camaro will have comparable power output, but most likely a better power to weight ratio.
I think that also means that the people buying Challengers will be the ones who are those who have a particular attachment or loyalty to dodge or challengers.