I don't think anything will happen at the new land, but as others suggest it frees Disney to do more development within the current boundary of WDW.
Does the lodging project at River Country have all the water permits etc needed to build that project?
I feel like this purchase is a precursor to a few "smaller" projects. Maybe the resort at the front of epcot? Maybe something not even in the rumor mill yet.
I also seem to remember when the gondola project was uncovered, there were strong rumors of another transportation project that would link AKL to AK and maybe more(but not a gondola). Did that ever get any more traction.
Anyways, I don't think this is any sort 5th gate move, in case anyone is going there. I'm also not convinced it has any direct connection with any project. It may just be a savings bank to make things easier in the future.