There was an excellent review on this yesterday under the heading "Tea with Alice on the Fantasy?" She noted that the princesses included Cinderella, Belle, and Tiana. The review had photos as well.
I believe it is typically the "classic" princesses, but it could vary. I doubt Anna & Elsa would be included, at least not right now while they are so popular.
I was on the Fantasy last week and attended the Princess Tea Party. It was hosted by Chef Brûlée & Lady Chamomile. There were three princesses: Cinderella, Tiana and Ariel. They brought toys for the children and spent one and one time with the kids to include pictures. My girls LOVED It.
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