Hi there, Peter!
Typically, Artist Point in Disney's Wilderness Lodge is open for Christmas dining, but does not offer a special Christmas menu.
The Disney Food Blog, a very well-respected fan site (not immediately affiliated with Walt Disney World) provides a great breakdown of Christmas dining-related events at the World: http://www.disneyfoodblog.com/2010/08/12/dining-planning-for-christmas-in-disney/
In 2011, the choices were as follows (courtesy of About.com):
Liberty Tree Tavern (Magic Kingdom): This location offers a Christmas menu for lunch and dinner on the big day.
Biergarten (Germany Pavilion, Epcot): Celebrate the season with a hearty brew and sample the Christmas menu at dinner or lunch in Germany.
Tutto Italia (Italy Pavilion, Epcot): Get a Christmas meal with authentic Italian flair for either lunch or dinner at this location.
50's Prime Time Cafe (Disney's Hollywood Studios): Go back in time and let Mom dish up a helping of Christmas cheer for dinner.
Hollywood & Vine (Disney's Hollywood Studios): Enjoy a fun-filled Christmas lunch with your favorite Playhouse Disney characters at this location.
Tusker House (Disney's Animal Kingdom): Character dining plus Christmas cheer await you at this African-themed buffet dinner location.
Disney will typically announce its special holiday menus closer to December, so do be on the lookout.
Using history as a predictor, you will certainly want to make your dining reservations as early as possible -- remember, you can make reservations 180 days prior to the start of your Walt Disney World vacation by calling (407) WDW-DINE or by
using the online system.
Have a wonderful trip!
See you later, celebrator,
-Deborah B.