Today the Disney Parks blog posted about the most they know about opening here are the dates so far
July 2012: Both sides of Dumbo the Flying Elephant, Dumbo’s big top tent queue, and the Casey Jr. Splash ‘N’ Soak Station kids’ water play area
Holidays 2012: Under the Sea ~ Journey of The Little Mermaid, Enchanted Tales with Belle, Be Our Guest Restaurant, Gaston’s Tavern, and Ariel’s Grotto
2013: Princess Fairytale Hall (meet-and-greet area)
2014: Seven Dwarfs Mine Train attraction
More info is in most recent all the details post on
http://disneyparks.disney.go.com/blog/