Not to be the one that drags this all down...but the original rumor is barely even a rumor. It mentions a "mystery project" for Epcot in 2015. Beyond that, every other comment in the story is speculation by the author's part.
Not only could that be ANYTHING at all, in could be practically NOTHING. It could be a new exhibit in innovations. It could be a overhaul of Electric Umbrella.
The one thing I think we can be pretty certain is in not a NEW pavillion or country in world showcase. These things take much longer than 2 years, so anything in that regard would not be coming in 2015.
skierPete
P.S. I am all for Epcot getting some love. I didn't understand the overall for Test Track, when there is so much in that park that desparately needs attention. I'm just saying let's not get too excited over this comment.