The official site for Pokémon Mystery Dungeon: Explorers of the Sky now features new screenshots and info for Chunsoft's latest roguelike, which is a slightly updated version of Explorers of Time/Darkness. It's the Mystery Dungeon equivalent of Pokémon Platinum, basically -- same game, with a few new Pokemans and new quests. Thanks to the Pokemaniacs at serebii.net who immediately got to translatin', we can all read about the added content.
The critters featured in Platinum will show up in Explorers of the Sky, including Shaymin and the new, wormy Origin Forme of Giratina. At least two new sidequests will be available, which help fill in the game's story. "Genius Igglybuff" stars the leader of the Wigglytuff Guild (in his past as an Igglybuff, and man is this getting weird to write) on an adventure with a Smoochum, a Wooper, and a Budew; "In the Dark Future" follows the game's ending, which means that we probably shouldn't talk too much about it, in the interest of keeping spoilers locked safely away in a Pokéball.