Hi Stacy,
The brochure which you can see on the Walt Disney World website
HERE right now, lists most of the participating dining locations for 2012....but not all of them!
The reason for this is because each individual non-Disney operated dining location has until the end of the year to decide whether or not they would like to participate in and be included on the Disney Dining Plan the following year.
As the Maya Grill Table-Service restaurant and various Quick-Service dining locations located at Disney's Coronado Springs Resort have been included on the 2011 Disney Dining Plan, I would say that there is a very good chance that they will be added as participating dining locations in the 2012 Disney Dining Plan at some point between now and the start of next year.
I would suggest that you keep your eyes peeled and check the Walt Disney World website periodically between now and then to see if the brochure has been updated.
Wishing you a magical trip!