Sort of like answering the question "How long is a piece of string?"
We used to receive PINS quite a bit a few years ago...then the PIN Gods stopped smiling on us..

There does not appear to be any rhyme or reason as to who, when or why people get PINS.
You can try and do the things that some folks say might trigger one...update your profile of WDW, save a few vacations on the WDW website, request the Free Planning DVD..and keep your fingers crossed.
All that being said, I would imagine it would be way to soon to see PINs for 2013. With the rates just being released last week, I would imagine Disney is going to give it some time to see how many will book full price vacations before they start sending out offers to fill rooms.
If all else fails you can join those of us who are watching

and waiting for the GP discounts this year.