Yes, AAA is just a flat % discount off the room rate. In Value season it's been 15% off Deluxes, 10% off Moderates and Values. During the other seasons it's 10% off Deluxes, 15% off Moderates and Values. Holiday season AAA rates are not usually available.
AAA actually needs to "release" 2008 discounts before Disney can apply them to 2008 reservations...it may be a combination of AAA and Disney together that releases them

.
Basically, they need to determine if they're going to stick with the same % off by season as well as how many rooms at each resort will be offered at the AAA rate. There are a limited number of rooms available for AAA, so it is possible that while the hotel itself has rooms available, there might be none left at the AAA rate (another good reason to watch for when the rates come out

).