Here are the confirmed worlds once and for all!
Twilight Town
Land of Dragons (Mulan
Olympus Coliseum (Hercules
Beast's Castle (Beauty and the Beast
Agrabah (Alladin
Atlantica (Little Mermaid)
Isla de Muerte (Pirates of the Carribean)
Halloween/Christmas Town (Nightmare Before Christmas)
Disney Castle
Hollow Bastion
Steamboat Willie World
Deep Dive World
Castle Oblivion (seen, not known if playable)
Destiny Islands (seen, not known if playable)
100 Acre Wood (reported by japanese mags)
There you have it.
The Pride Lands aren't confirmed ... yet. Nomura's favorite Disney movie is the Lion King, and he loves Lions. Plus, it was on the Buena Vista site. It's very possible that it will be a world