If you consider any of those things at the parks other than Magic Kingdom(those being the three) a new major built attraction. You have an skewed view of theme parks.
Toy Story Mania opened in 2008. As cool as it is, I hardly consider Star Tours a major new attraction, just a really good revamp. Captain Sparrow at the same park...yeah..not major. American Idol? Really? The show that can't even get three people to compete anymore? It was never a major attraction to begin with. This park has gotten the most attention, but none are major attractions. There are no signs of construction work so therefore we have likely at least two years before anything new of major attraction status really comes.
As for Epcot, Test Track just opening this year is another good example of a really good refurb, revamp. It used the same exact ride dynamics and just re-branded it. It was less of a revamp/retheme than Star Tours was. Besides this event what has happened before it at this park? What is happening beyond it? Even if Test Track is passed as a new attraction, the park is still in a sorry state of lack of progress.
Animal Kingdom...