I've been trying to get a PCO for a couple months now. I found a thread on the Ford Tremor forums that stated their outlined process was almost guaranteed to work, so I gave it a shot last Friday (Jul. 30) and sure enough I received a PCO on Aug. 3rd. Here is what I did:
1) Log In or Create an Account on ford.com
2) Enter all your contact info to your account
3) Go to Super Duty and select "Search Inventory"
4) Click "Find My Ford" under "Let Us Find It For You"
5) Pick the options you are looking for...
6) On the right side of the page make sure both "Include Ford Credit Offers" and "Yes, email me information on Ford Vehicles and specials" are checked.
7) Here is the key, repeat steps 3-6 and change the "Select Your Closest Authorized Dealer:" to a different dealership each time you do this.
According to the original forum thread I read on this, by changing the dealership it adds a new entry into their marketing database and thus increases your odds of being selected to receive a PCO offer. Now be prepared to be constantly hounded by each dealership with sales people trying to get you to come in so they can make a sale. Some dealerships I have had multiple sales people calling, emailing or sending text messages.
I have tried a number of other methods to get a PCO offer and nothing seemed to work for me until I tried this method. Here is the link to the original thread I got this idea from and there are 55 pages of responses with lots of people stating this worked for them as well: Ford Tremor Forums | PCO Offer