I think you may be confused/misinformed. What you may be referring to is American Maglev Technology's (a private company) plan to build a monorails style maglev train from the convention center to the Sandlake Road Sunrail station, to the Airport's new South terminal complex, to Medical City, to the Osceola Parway Sunrail station, to the Gaylord Palms, and lastly to Disney World. This is a multiphased project. The City of Orlando's most southern limit is just past Universal Orlando, so they do not even have the jurisdiction to build something into Disney World. Disney has also not commented on the subject of outside rail transport coming onto their property. I do believe that if Disney ever did comment on the subject it would be something like what you describe. If you would like more information on the subject the Orlando Biz Journal has many good reports on it, her are two that I found:
http://tinyurl.com/ozfuyvj On its location.
http://tinyurl.com/njaelsn and one on numbers on the project.