If you download the disneydashboard on your computer (available to ap holders) it will tell you when there are ap rates. Sometimes in the little magazine they send out. I will say they are few and far between. Its a couple times a year, with little notice. Usually they only last a few weeks so if you need to fly it would be hard to take advantage of them.
With spring break, the pirates premier, and Nemo, I would guess there wont be much of anything offered for a while.