ecorded on October 27, 1966, less than two months before his death, Walt Disney made a 25-minute film about his plans for the Florida Project, then dubbed "Disney World". In the film, Walt himself explains briefly how the Florida property will be utilized and how his EPCOT concept will work with the other aspects of Disney World.
Disney made this film primarily to persuade and encourage American industry and various corporations to opt in and help Walt Disney Productions in the creation and running of EPCOT. Disney also encouraged the industrial companies to come up with their best ideas in technology, so that those ideas could be continuously demonstrated in the city. - from Wikipedia

Overview from themoviedb.org