Download the Gluten Free Disney App. We use it all the time, and it has been very accurate. There are no official Gluten free menus that you can download, but every resturant will accommodate your allergies quite nicely. They will usually send out a chef to discuss your sensitivity, and make you special meals. My wife LOVES eating at Disney, and she usually eats better than the rest of us. She says the sandwiches at Jolly Holiday are outstanding, Plaza Inn has excellent waffles.
Edit: app is called "Gluten Free Disney Dining" it is by a company call Calypso Kid.