Here are the attractions open during early entry at MK:
Magic Kingdom-Sunday, Thursday
Astro Orbiter
Buzz Lightyear's Space Ranger Spin
Cinderella's Golden Carrousel
It's a small world
Mad Tea Party
Main Street Vehicles
Peter Pan's Flight
Snow White's Scary Adventures
Space Mountain
The ExtraTERRORestrial Alien Encounter
The Many Adventures of Winnie the Pooh
Tomorrowland Indy Speedway
Tomorrowland Transit Authority
I guess all other attractions open at their normal time on ee days.