How good is the new Hemi, REALLY?

Some changes are in store in 2008 -2009 too.

from allpar's site:

The Hemi engine is set for an upgrade, which may be why the non-SRT Challenger will take some time to show up. By 2009, Chrysler will have variable cam timing set up for its Hemi engines, neatly leapfrogging most variable-valve timing systems. The multiple displacement system is expected to remain for most, if not all, 5.7 Hemis. A 6.4 liter version is still expected, with 450-500 hp, though whether this is earmarked for the Challenger or not is still in question.