Here is a published timeline for Chrysler Group's 2005 models:
The 2004 Dodge Durango, as we all know by now, gets the HEMI.
The 2005 Chrysler 300 and Dodge Magnum wagon will have the HEMI
somewhere in their options line. Rumors suggest the 2005 Dodge
Dakota will get the new HEMI, too (that will be awesome). The
2005 Jeep Grand Cherokee should get a dose of the HEMI. It is
good to see the HEMI spreading throughout product lines!