OK. The Lotte World Aqua Trax has about three trains on the track at a time. They could still make it a dueling version, which would solve a lot of the capacity issue. They took out a water ride, so to replace it with a quasi-water ride and get a coaster (or two) in the deal doesn't sound that bad an idea to me.
If it's the Ball coaster, I don't even want to think of the complications of that. I have only seen single car trains for that, and there's another 8-passenger train and the same capacity issue on top of prototype bugs.
The truth is none of us will know until CP wants us to know.