If you guys check out the Sunrail website they actually have a few links about the North-South light rail and OIA light rail lines.
The North South would do along I-4 and connect Altomonte to Downtown, down to I-Drive outlets, and Universal. It would pass down Lockheed, and then connect to the Convention Center (and the OIA Line) and down to Sea World.
The OIA line would start at the Convention Center, and head east past Florida Mall to OIA. It would then turn South and connect to the Medical City.
There is actually a private company (Maglev inc?) from Georgia that is talking about building the OIA connector line.
The biggest reason Disney is not on "the list" of stops, and the N-S ends at Sea World is due to Disney not wanting *any* stop that connects to Universal (or Sea World I guess).
If a line ever goes to Disney I'm guessing they would have to work out a deal where it uses a route along 417 and where Disney can run their own trains (replacing the Magical Express).
It could be a cool concept. Imagine a special "disney resort only" station where every 30-min to an hour a train comes. They could do a Party-Jam to entertain the guests, and maybe some character meet and greets. They could have the train look old school, and maybe even have conductor mickey.
Heck, you could even go all out and use projectors along the windows (like what Universal is doing for the Harry Potter expansion train) and really tell a story...and better yet, hide the non-disney-orlando, from guests.
Anyways, Light-rail lines in orlando (unless the private sector really takes ownership of this) is still 15 years away (at best) since FDOT and the state are busy with SR 429 & the Ultimate I-4 build out (which would rebuild I-4 from the Beachline/SR 528 all the way to Seminole County.