Not much is known of the new game, though according to a tweet from Ace Attorney fan site Court-Records.net, it will bear the title "Dai Gyakuten Saiban - Naruhodou Ryuunosuke no Bouken," which translates to "Grand Turnabout Trial - The Adventures of Naruhodou Ryuunosuke." From this, we can deduce that the game stars an ancestor of Ace Attorney protagonist Phoenix Wright (who is known as Ryuichi Naruhodo in his native Japan). The character portrayed in the scan does indeed resemble Mr. Wright, though the latter never wore a katana into the courtroom.
Finally, Court-Records reveals that long-time Ace Attorney developer Shu Takumi is once again leading this project and that it is currently in development for the 3DS handheld. It's currently unknown if the game will make its way to Western shores, or if it will remain exclusive to Japan.