Interesting. It is really throwing my WDW touring plans out the window, I really don't see how this is going to make that much of a drastic change at WDW. From what I've seen on blogs it has created huge lines at the FP return. But that's just my opinion...I guess we'll have to trust the mouse.
In DL the return lines can get longer later in the day as people delay returning. Star Tours last Summer has 30-15 minute waits with FP. Space can get 15 minutes long.