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.
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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]