I have no idea why they wouldn't include Dr. Facilier, especially since he's used extensively at MNSSHP and Oogie Boogie Bash. It's not like they have a history of trying to keep him out of the parks. He's always super popular at those events and would be on this ride, too.
On a ride that's as long as Splash, I just can't imagine Facilier not being included so i'm still going to hold out hope.