We went in May 2010 and she was there. No guarantee on who is there but we had Alice, Mary, Mad Hatter, and Tigger and Piglet too. After all it is the Supercalifragilistic Breakfast, that could not exhist without Mary.
I have it booked specifically for Mary Poppins (for my mom), Mad Hatter (for me), Alice in Wonderland (for DD10), and Tigger (for DD16). I hope it hasn't changed!
Of course, if it has, I won't be too disappointed. I've heard the food is yummy too!
Unless it has changed since last year, the breakfast at 1900 Park Fare has Mary Poppins, Alice in Wonderland, the Mad Hatter, Pooh and ( I think but am too lazy to pull out pictures or autograph book ) Tigger. It's one of our favorites and can't wait to go back in November.