Release Date : ?/6/08 , USA
Description from Wikipedia.org :
Mega Man Star Force 2, known in Japan as Shooting Star Rockman 2 (流星のロックマン2 Ryūsei no Rokkuman Tsū), is the sequel to the Capcom’s 2007 Nintendo DS role-playing game, Mega Man Star Force. The game was first confirmed on April 12, 2007 in an issue CoroCoro Comic. The same issue also revealed that a boss design contest would be held exclusively in Japan much like the same contests held for the Battle Network games.
In a similar format to Mega Man Battle Network 5: Double Team DS, each game card contains two versions of the game, available as Saurian (Berserk × Dinosaur in Japan) and Ninja (Berserk × Shinobi in Japan).
Official Site : http://www.capcom.co.jp/ryusei2/