According to wdwmagic the National Treasures Exhibit at the American Adventure pavillion in Epcot is set to open
"One of the most amazing collections of real-life Americana ever assembled -- National Treasures -- arrives Sept. 28. It's located inside the landmark Epcot attraction at the center of World Showcase, a place where Walt Disney World guests can become completely immersed in the astonishing authenticity and culture of eleven great nations.
"These are the jewels of museums and foundations all over the country, all gathered in one place," said Jim Clark, Walt Disney Imagineering Ambassador Representative and one of the team members designing National Treasures. "You'll see one of Abraham Lincoln's actual stovepipe hats, which has never been publicly exhibited outside of the Lincoln family home in Manchester, Vt. "We're also presenting many of Lincoln's personal items, like the book of Lord Byron poetry that inspired his second inaugural address and his dressing room mirror -- where he probably took his last glimpse of himself before he went off to Ford's Theatre."