For breakfast, Cinderella should be downstairs greeting and you'll get a picture taken with her.
Upstairs, during the meal, the typical Disney Princesses (4 of them) will come out and about. Of course, there are no guarentees, but it's typically Snow White, Aurora, and Belle (in her blue dress) and then one more (Jasmine, Ariel, and I think a couple others have been reported).
As far as food, as of mid-late September, they gave you a dish of fruit and then 3 choices for different pre-plated meals. Unfortunately, I didn't listen closely, but there was a meat dish (eggs, bacon, sausage, etc), a "sweet" dish (berries, fruit, stuff french toast? or puffed? or something), and a "healthy" plate (yogurt, granola, etc).
We weren't told if we could have refills on the food (we didn't eat much anyway). Little ones under 2 get a free plate of 2 french toast sticks as well.