It's gonna be buses, don't you think? But, it sounds like they want to connect their parks and make the transition as seamless as possible, so they want their own right of way. I wonder if they'll install screens like they have on the Hogwarts train, so guests look out the 'window' and see anything but I-4 sprawl.
But, yeah, a monorail would be so freaking cool. And, what better shot across the bow at the Mouse could you build than that?