Quote From: ChanceOne thing's sure, it won't be a brand new game (aka: new generation), as they're far from being done with the V one so far (as far as the anime/movies are concerned, and we all know they 'work' together).
It may be the infamous Pokémon Grey, though I'm not sure whether it'd be on DS and/or 3DS.
Or maybe a 3D game, like Stadium/Revolution or Colosseum.
It's probably gonna be for the 3DS.