For what it's worth I was looking at reservations today online and it had different princesses listed for different times during the day. Hope that helps!
when we were there, Cinderella was downstairs taking the formal pics; Sleeping Beauty, Ariel, Snow White & Belle are the princesses we saw while we had dinner.
In Nov at the breakfast, we saw Cinderella downstairs. Upstairs we saw Ariel, Jasmine, Belle (in her blue dress with the white apron) and Aurora. We saw Snow White by the entrance to MK