Here is the latest information from Walt Disney World about attraction closures and refurbishments.
Magic Kingdom:
Plaza Ice Cream Parlor 1/4/12 – 3/27/12
Dumbo the Flying Elephant 1/9/12 – 2/17/12
Big Thunder Mountain Railroad 1/9/12 – 5/27/12
Liberty Square Riverboat 1/2/8/12 – 2/3-12
The Magic Carpets of Aladdin 2/26/12 – 3/10/12
Epcot:
Tutto Italia Rist0rante 1/8/12 – 4/30/12
Innoventions 12/4/11 – May 2012
Test Track April 2012 – September
Hollywood Studios:
Sounds Dangerous Closed
Fantasmic! 1/9/12 – 2/12/12
Studio Backlot Tour 2/13/12 – 3/10/12
Animal Kingdom
Kali River Rapids 1/24/12 – 2/9/12