Check out the Georgia World Congress Center's website. Their calendar of events has the dates/times, but I'm not sure if there is specific info on exactly which cars will be there.
I've gone to the Atlanta Auto Show for the past few years and they always have the latest concept cars. Last year I saw the Mustang GT concept car, so I'm sure they'll have either the 2005 production models on show. It would suck if they didn't. Lots of exotics there also. Since the major Auto Shows do not overlap on dates, I bet we see nearly all of the cars that appear at Detroit/Chicago.