I too have heard those rumors... Not sure it's gonna happen. It could. Someday. But probably not soon.
Unless....nah, probably not. But with Disney, you never know. We may know but most probably don't for sure. But, anything can happen. So yes, I have heard rumors about this. A few times actually. No, actually more than a few times. Many times to be exact. Yet still, no new monorails.
We can still hope though that maybe someday we'll see more monorail service. But until then, we'll just see monorail expansion rumor threads popping up discussing, dreaming and wishing for monorail service to all parks and resorts.
I did hear a rumor that they will begin flights directly into the airport on Disney property in the future. But that is probably down the list behind Beastly Kingdom...and Harry Potter rides.