Different from Diamond & Pearl, this new entry isn't one of the main RPG entries in the Pokemon franchise (most notably, it isn't the expected third entry in the Diamond & Pearl series). Instead, developer Chunsoft is once again taking on the license for an as-yet unnamed dual SKU release set for Japan some time this year.
Chunsoft previously worked on Pokémon Mysterious Dungeon, a dual SKU release that hit Japan in late 2005 (followed by international releases in 2006), with one entry coming to the DS and one to the Game Boy Advance. This unexpected pairing of the Mysterious Dungeon series with Pokemon was a huge worldwide hit, selling over 5.5 million copies.
This time, both versions of the game will be on the DS, allowing Chunsoft to further take advantage of the DS's unique feature set. The game will make better use of the dual screens, and will even include Wi-Fi support. The game's designers are hoping to give players the feeling of playing with others.
That's all we know at this point. It's unclear if the new game will be a Mysterious Dungeon title. But we're pretty sure it will have Pokemon, and that should be good enough! With a 2007 release, specifics shouldn't be too far off.
