F-450
Actually, if you look at the configuration section under the F-450, it shows a 172" wheelbase - the same as a longbed, long wheelbase F-250 / F-350. I'm guessing if that's the case, the bed is a standard Ford 8' bed. Pretty cool because I was worried that they would use the 176" WB and...
I just found this link to the Ford media release. Enjoy:
http://media.ford.com/products/presskit_display.cfm?vehicle_id=1515&press_subsection_id=421&make_id=92
JC