Stephanie,
Many of the attractions are open during extra magic hours. Here is a full list of open attractions, from the Disney World web site's FAQ list...
Magic Kingdom Theme Park
Mornings:
Buzz Lightyear's Space Ranger Spin, Cinderella's Golden Carrousel, Dumbo the Flying Elephant, "it's a small world", The Many Adventures of Winnie the Pooh, Mickey's PhilharMagic, Peter Pan's Flight, Space Mountain, Stitch's Great Escape!, Tomorrowland Speedway
Evenings:
Includes attractions listed above and Big Thunder Mountain Railroad, Haunted Mansion, The Magic Carpets of Aladdin, Pirates of the Caribbean, Splash Mountain
Epcot
Mornings:
Living with the Land, Mission: SPACE, Soarin', Spaceship Earth, Test Track
Evenings:
Includes attractions listed above and Honey, I Shrunk the Audience, Journey Into Imagination With Figment, Mexico - Gran Fiesta Tour Starring The Three Caballeros, Norway-Maelstrom, The American Adventure
Disney's Hollywood Studios
Mornings:
Muppet Vision 3-D, Rock 'n' Roller Coaster Starring Aerosmith, Star Tours, Toy Story Mania!, The Twilight Zone Tower of Terror
Evenings:
Includes attractions listed above and The Great Movie Ride, Voyage of The Little Mermaid
Disney's Animal Kingdom Theme Park
Mornings:
DINOSAUR, Expedition Everest, It's Tough to be a Bug!, Kilimanjaro Safaris, Pangani Forest Exploration Trail
Evenings:
DINOSAUR, Expedition Everest, Festival of the Lion King, It's Tough to be a Bug!, Kali River Rapids, Primeval Whirl, TriceraTop Spin
Attractions are subject to change without notice.