Looks like the 6.4 Hemi is coming afterall
From the Jalopnik:
While talking about the 2011 Grand Cherokee SRT-8, they included the following:
(Would love to see how Dodge is going to "refresh" the Challenger)
"The biggest news we've received is the high-po Jeep will receive the 6.4-liter 392 HEMI V8 with anywhere between 505-525 tire burning horsepower and roughly 510 ft-lbs of torque, all driven through a revised AWD system. The 392 HEMI has also been rumored to show up in other 2010 SRT8 models, but we're guessing it'll arrive first in the mid-cycle refresh for both the Challenger and Charger in 2011".