My guess is that the next one will be over closer to the MK somewhere than even VWL is.
Either a "redo" of part of the Contemporary, or maybe they have some land kicking around over there (that STOLport thing that was in that link) that they could build on.
It's possible that the next one could be the Eagles Pines thing, because that is sort of close to the MK, but I truly think they are going to want one with a direct connection, by walking or monorail, to the MK, and any of the golf courses would be a bus ride.
They seem to like to sort of "attach" the WDW DVC resorts to an "area" by foot or boat.
Of course, the AK area has no DVC near it yet, but I also don't think there's quite enough other "stuff" out there yet to warrant putting a DVC there...yet.
VWL has the MK...a big draw, and if some folks only have a day or two at WDW, they will probably go to the MK, since it is what a lot of people think of when they think of Disney...Cinderella's castle etc. BCV & BWV have Epcot and MGM, along with the Boardwalk area, as their draw. OKW & SSR have access to DTD as their draw. Lots to do in most of those areas...all the AK area has is the AK, and it's a tad bit of a secluded area out there, so I don't think the VAKL would be the next resort.