The official Japanese Pokémon YouTube site has posted the first trailer for the upcoming Nintendo 3DS game Pokémon Mystery Dungeon: Magnagate and the Infinite Labyrinth (ポケモン不思議のダンジョン　～マグナゲートと∞迷宮～). The official website also launched and posted a very basic outline of the game with a few screenshots.

Magnagate and the Infinite Labyrinth Trailer

Source: http://www.pokemon.co.jp/ex/dungeon_magnagate/