Siliconera. The game is in development for 3DS and is currently exclusive to Japan.
Producer Shintaro Kojima says that while the next game is "not a main-numbered Ace Attorney title, it's the start of a new series called The Great Ace Attorney" and that "it's not simply just a derivative title." Series creator and director Shu Takumi also noted that "the image and feel behind its play will be quite different from all the other Ace Attorney games up until now."
The Great Ace Attorney was revealed in the latest issue of Famitsu this week, and is set in Japan's Meiji period. The game's protagonist is Ryuichi Naruhodo, an ancestor of the series primary hero Phoenix Wright. Capcom's first trailer for the game introduces Naruhodo and a new heroine, Susato Mikotoba, who Kojima says is "pretty much a graceful Japanese woman, a proper girl who does everything the proper way."