From my understanding of what I've read, it appears the 2010 Mustang's engine lineup will include the 3.5, the EB 3.5, and the 5.0 V8. There are also rumors of I believe an EB 2.5, and IIRC, maybe an EB 5.0. I'm not sure if the GT500 would retain the 5.4 or change motors.
I believe the Cologne is being phased out, I'm not sure what would replace it at the plant though.
Ranger will be replaced in a couple years, (I'd assume the Mazda would be replaced as well, or maybe just dropped), Mustang if rumors are right will be receiving the 3.5, as stated above, and the Explorer/Mountaineer (if the Mounty is kept) will be redone with likely the EB 2.5 and EB 3.5 as in the concept.