Not really "Redressed". Disney always re-utilizes unused material.
Take Discovery Bay-its concepts were unused until Discoveryland was built. Of course, It would have been cool have a Hyperion ride instead of a cafe, but hey, the movie really wasn't that good (Island at the Top of the World)
Theres a ton more concept art that wasn't used, including a painting of Ellis Island during a fireworks dispay over the Statue of Liberty, etc. It can be found in the Disney Imagineering book.
SUPPOSEDLY Test Track came out of an idea that originated with Disney's America (you would board Ford motor cars and zip through a factory). Of course, I'm only repeating someone elses material.Take that with a grain of salt, please.
Disney wanted to put it in VA. because of all the historical importance of the area. They needed to find a location where they would be near other landmarks of historic value. Florida isn't really known for its historic importance other than Ponce De Leon and the Fountain of Youth myth. I think they would rather put it inTexas or back in VA. before they'd ever ever ever put it in Orlando.
ON MOUSEPLANET, THEY RECENTLY SAW THAT THE SAME PLOT OF LAND WHERE THEY WERE GOING TO BUILD DISNEY'S AMERICA, A CHEAP WATER PARK AND A HOTEL HAVE BEEN BUILT.