lol, so getting this topic back on track:
Looks like the prospect of the long-awaited adventure course is out of the question now that the chain is suddenly removing them from their properties. Up until that happened I was positive something like that was coming to the space vacated by the Waterboggin, and maybe that was the plan, but it looks like they can't take the associated risks anymore.
So what else could go there? The other popular theories included a G-fighter or some variant, but it seems like the chain has not rushed back to Gerstlauer to add another like they probably would have if they really loved MM. I think the mixed reviews of MM might have scared them off of the concept, even though MM is the most visually impressive ride they've built yet (IMO).
The other popular idea that was discussed a few seasons ago was putting the Mack SuperSplash from CC back there. That could be a very likely possibility for 2015, I would think.