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Pokemon Mystery Dungeon Time Expedition and Pokemon Mystery Dungeon Darkness Expedition are a matched pair of Pokemon games for the Nintendo DS. The games are a sequel to Pokemon Mystery Dungeon and are currently only available in Japan. There is no release date for the games in other areas of the world yet.

Remaining three to be released in December

The Pokemon Daisuki Club has announced that the Wonder Mail for four of the seven hidden dungeons in Pokemon Mystery Dungeon: Time and Darkness Expeditions are available for download over Nintendo Wi-Fi Connection. Three more will be released mid-December. Each of the hidden dungeons contain a special item which unlocks a corresponding legendary Pokemon not found in normal gameplay.

The seven legendary Pokemon are: Kyogre, Groudon, Articuno, Heatran, Giratina, Rayquaza and Mew. Additionally, there are some non-legendary Pokemon found only in those dungeons, such as the Ekans family, Ditto and the Treecko family.
Sources: http://bulbanews.bulbagarden.net/ & Pokemon Daisuki Club