I know there was talk about there NOT being a 3rd game to this collection on the DS, and maybe that's still very true. However, no one said anything about the 3DS.
Taking a second look at this, and the ports the 3DS has been getting, it would make perfect sense to kick off the Pokemon 3DS RPG series this way. A game that, for the most part, already has it's framework built. Now, the only thing I would have a question about if that were the case is, would a 3DS release be a direct DS port of Black/White? Or would it be a graphical overhaul of the series, with character models similar to the Pokedex 3D app.?
Then again, maybe this domain name was registered just for the sake of being registered, and not allowing a independent fan game mod to surface.