Don't believe a single lying word that comes out of their mouths. I was told a year and a half ago I could upgrade too, and I still have no Nav. When I pre-ordered the car the *only* thing I demanded the car had was full navigation system. The dealership screwed me over and left me with a car without the Nav system. I was told time and time again that adding it would be possible soon...
...and here we are a year and a half later and every Ford tech is still saying it's not possible. I've been working on doing it myself, but Ford is being *COMPLETELY* unhelpful in the entire situation. They won't even give me part numbers for any of the modules in the car, so I've had to get them from others with the car.