The guys from Contra Hard corps (kinda), Guardian Heroes and Sin and Punishment are working on a new 3DS game
http://www.siliconera.com/2012/10/31/sin-punishment-developer-treasure-working-on-nintendo-3ds-game/
Sin & Punishment and Ikaruga developer, Treasure, are working on a Nintendo 3DS exclusive, according to a report at Nintendo Life, who spotted an interview with company president, Masato Maegawa, in U.K. magazine GamesTM.
“We are making a new game on Nintendo 3DS now,” Maegawa reportedly said to GamesTM. “Not multiplatform, but exclusive to 3DS.”
Maegawa also suggested that the game in question is an action title, but no further details have been shared thus far.
In 2009, Treasure released Sin & Punishment: Star Successor, a sequel to the original Nintendo 64 game, which was published by Nintendo. Following that, they’ve released Xbox Live Arcade versions of Radiant Silvergun, Guardian Heroes, and Bangai-O HD.