Well, the intake cracking problem is one that Ford didn't shy away from repairing too much I don't think because it was a common/fairly expensive problem. They owned up to it pretty well. Besides, if the dealership says no, and its within the range that it should be covered, all you have to do is call Ford, and in turn they'll call the dealer and bitch slap them because I'm pretty sure its illegal to deny you.
As far as being covered. I'd check websites like blueoval and see what the time frame is. I believe its between 5-7 years that you have to be covered if it cracks.