I can see it being more katanga themed but its far to close to mutiny bay to be katanga or gloomy wood IMO so I think we'll see minor themeing changes to mutiny bay to accommodate it. It could be a pirates voyage to an island with paganism.
The idea of an "Island" is actually probably the most plausible route for the Resort to take, although its not something I'd personally like to see, it'd make the most sense. SW8 and its area is surrounded by the Congo-River Rapid's and in close proximity to Mutiny Bay, another water based area. I also recall somebody earlier in the topic talking about the ride having a Skull Island/universal feel. It could be an interesting marketing strategy to market the ride as waiting on a previously undiscovered, dark and mysterious island or piece of land, settled in-between Katanga Canyon, and Mutiny Bay, sourcing its dark powers from Gloomy Wood. The narrative of the whole "Be Chosen" thing could work well with this concept, step upon the island, but be warned, will you be chosen?. Again I will reiterate its not something I'd like to see, neither do I know if the resort would even entertain such an idea. I'd much rather the ride just form an extension to an existing area, however if you consider its positioning so close to all three areas with a seemingly detached entrance area, an island could make sense. Sense aside, the most likely outcome as others have previously stated is some kind of general name change for either Gloomy Wood or Mutiny Bay, focusing semantically maybe on myths and legends or historical magic.