The following post was found on allpar.com:

"We can expect three 5.7 Hemis in 2009; the variable-cam edition should be around 380 hp. At the same time, a 6.4 liter Hemi is expected to get nearly 500 hp (we have heard a range from 450-480 with the most recent estimate at 475, and better mileage). He also said that the 6.1 Hemi (SRT version) might get MDS in 2009 or 2010."