According to Japan's Corocoro magazine, the latest Pokémon Mystery Dungeon, Pokémon Mystery Dungeon: Magna Gate and The Maze of Infinity will be out on the 3DS this winter in Japan.
The Corocoro article calls the game "totally new" and "totally different" from Pokémon games up to now. Have a look at the game—and its 3D graphics—in the scans above.
3DSでポケダン新作ｷﾀ, シングルバトル最強クラスのポケモンプレゼントは [pokemogu01 via オレ的]