I never had any doubt that Avatar and Frozen would be the anchors of the Disneyland side of Disneyland forward. Neither fit DCA at all, and they need their 2 biggest cash cows out there if they want people to walk all the way to the back of critter country, then across a bridge to a former parking lot.
Yes, this will take 4 or 5 years, but hopefully that means they will be able to include characters and storylines from later sequels. I fully expect more info at D23