There is a menu posted on allears.net. We went to this dinner when we were there in November. It was the best food of the entire trip and the character interaction was excellent. The night we were there the characters there was Cinderella, Prince Charming, Lady Tremaine and the two step-sisters. I think these are the usual characters at the dinner.
We were there for over an hour. I would assume that you should have time to make it back to wishes especially if you use the monorail.
Enjoy your dinner!