The Duratec35 is slated to go into the Fusion and Milan at a later date. Production has to ramp up on it and any issues need to be worked out of it. You don't stick a brand new engine in every car across your entire lineup at the same time. That's only asking for problems. So, for now, it'll start it's life in the MKZ (the Zephyr), the MKX, and the Edge. The Five Hundred and its' sister-cars will be getting it the following year with their redesign. It will probably take until the first refresh of the Fusion, in the 2009MY for the Duratec35 to make its' way there.
2007: Edge, MKZ, MKX
2008: Five Hundred, Freestyle, Montego, Mazda6, CX-9 (and Ford's equivalent)
2009: Fusion, Milan
With talk of Cleveland also producing the Duratec35, the schedule for the Five Hundred/Montego/Freestyle might be pushed up to a 1/2-year update, what with Ford being very explicit about its' desire to upgrade that line with a visual and power upgrade in a hurry. I doubt that'd push the timetable up on the Fusion though, since I don't know if they'd stick the new engine in there just before a revision was due.
