I think they have a couple of options of where this could go. First in the plot occupied by mummy and the soundstages to the left of it. I think this is the least likely option as I believe @chris.g said they are plans to address this area. Plus if you include Mummy in the plot, it would be larger than the original plot behind SNW. I would think they want the first option earmarked for another non Nintendo IP. But there is the current tram load and unload assuming they want to move the tram stop and make it an up charged experience. Then there is falls lake, which could work due to it being secluded with the jungle setting of DK.I agree but it doesn't help that someone fairly reliable said it's probably not happening.
But again, if they have a contract with Nintendo, they'll find a way. This just seems like a move the studio would've done in like 2007.