Looking at the map, I think that's the route they are planning to take. After departing Poinciana they can turn North near Reedy Creek and they have a straight shot to the property. It looks like about 3 miles from the right of way to where World Drive ends. Doesn't look like much development. They could parallel world drive onto the property.This has me puzzled, as I can't see how SunRail ROW helps in getting from the airport to Disney. SunRail runs predominantly north-south until Kissimmee, where it turns WSW to Poinciana. The Poinciana terminus is the closest it comes to Disney, and it's 6.5 miles SSE of the property's southern edge.
I wonder if there is a plan to serve the town of Celebration.