Not sure if I've missed seeing anyone posting about it here in the forum, but I just found this:
http://accessories.ford.com/aerial-asy-10667.html
Remote Access Makes Your Smartphone a Virtual Keyfob
Sean Johnston,
5/30/2013
Right now, the Remote Access system is available on the F-150, Super Duty®, Edge, Explorer and Lincoln MKX if your vehicle is a 2011 Model Year, or newer. You can also purchase it if you drive a 2013 model year or newer Taurus, Flex, Lincoln MKS or Lincoln MKT. Contact your local dealer for more information on pricing and availability. More vehicles will be added in the future, so stay tuned!
I have a message into my dealer to see if I can add this on my '13 Limited w/ MFT, Nav and push-button start.
<crossing fingers>
This appears to be the site to set up the app:
https://my.fordremoteaccess.com/home