The latest issue of CoroCoro has come out and mentioned that we'll be getting details of a new Pokémon game in next month's issue.
So far, we only know that new games are in the works for both Wii and 3DS, but don't have any details on them. Nothing is still known about the too-be-announced game, including whether it's the Wii or 3DS game, or if it's a side-game or a main series game.