Not sure how reliable this info is but I got it from a CM this past Saturday
1) The third gate has been green-lighted and yes, it is a water park themed after Pooh's hundred acre woods (the CM was very upset about losing their parking lot)
2) The Subs will not only have a Nemo theme but incorporate Ariel as well.
3) There is a big planned expansion of the Frontierland area as well as Adventureland (where, I have no idea).
There you have it!