All we've been told so far is Holidays. That could mean Thanksgiving most likely, which means probably soft openings in early November. But no solid dates or guarantees and probably won't be. Currently the Storybook Circus area is half open- with one of the Dumbos (the new one) open and the new Barnstormer and new Fantasyland train station and bathrooms. The second Dumbo, interactive queue tent with playground inside, Casey Jr. water play area and more should be opening in July. You can see a video of the cool new queue here:
http://www.youtube.com/watch?v=StXRHVpTYZ4&feature=related
Parents can relax on benches in the AC while kids play on the circus themed playground areas. There are a few more tents in Storybook Circus that we haven't heard much on, but assuming those might be open in July too. We expect at least one to be a gift shop and the other has rumors flying around it might be a place to recharge your phones/electronics with charging stations etc. I guess we will see.
Then opening "before the holidays" in 2012, is Under the Sea- Journey of the Little Mermaid ride, and all of the B&B area- Be Our Guest restaurant, the gift shops, Gaston's tavern and enchanted tales with Belle (new meet and greet featuring cool effects). We can assume before the holidays means Thanksgiving......but we can't be sure. I am hopeful though and if Thanksgiving is their goal, hoping for a soft opening in early/mid November.
The new princess fairytale hall that is replacing the snow white ride/building will be open in late 2013 and will feature some cool new ways to do a meet and greet.
The Seven dwarfs mine train is in 2014.
There is still a ton of construction though. they are also building a castle wall around that area, some of which you can already see near Pinnochio's Village Haus.
There is also construction over behind Haunted Mansion- the pet cemetary is gone for now. They are building a Rapunzel tower (rumored meet and greet for her) and bathrooms, plus a new walkway from fantasyland over to HM area.
Of course there is the tent still over the bakery, hoping some of those come down soon! They've been up there for months now. The buildings on Main St should look fantastic when all done!
Here are some great links on the expansion:
Magic Kingdom New Fantasyland Construction Update 6/6/12, June 6, 2012
All in the Details: The View from Belles Village in Magic Kingdom Park, June 5, 2012
Sneak Peek: Kids Will Star in the Show at the Big Top Tent at Dumbo The Flying Elephant, June 4, 2012
All in the Details: Introducing Prince Erics Castle at Magic Kingdom Park, May 29, 2012