The yellow ball gowns are in at PSB for Belle to wear in the Photopass location in the am and Ariel will still be there for the lunch/dinner seatings. They look just like the one Joanna has in her pic with belle in TT. The vibrant gold one that Candleshoe spoke of is only for Cinderellabration.
It always surprises me how many people and children say Bellle is their favorite princess but never know it's her unless she is wearing the formal dress. She only wears that for 2 minutes of the movie. We always laugh at work because Guests will see Belle in her village dress and think she is Alice, or a server or Wendy. And then they will complain to the attendants that they never saw Belle. I don't know. We all just want to say if Belle is REALLY your favorite princess, you would know her no matter what dress she is in.