I know you will enjoy your first visit to the "World" during the holidays. The Osborne Lights are nighty from 6-8pm and a must see. They dance to the music every 15 minutes and it is fantastic!
Probably by July they will announce the celebrity narrators, but Disney does revised the schedule throughout the Summer/early Fall. Each one usually performs three shows a night for a three day period starting after Thanksgiving.
A popular resort to visit is the Grand Floridian to see the Ginger Bread House and tree in the main lobby.
The Magic, Memories and You did play during the party last year so I assume it would again this year, unless they discontinue it for some reason.