'Batman: Arkham Origins Blackgate' is the portable counterpart.
'Batman: Arkham Origins' is the prequel style follow-up to 'Batman: Arkham City,' but as had been rumored is not being developed by series' creator Rocksteady Games. Game Informer has shared this information along with their May issue 'Batman: Origins' cover.
The game is being built with Rocksteady's modified Unreal 3 engine and is set for an October 25 release for the Xbox 360, PS3, Wii U, and PC. There is no telling of how the PC version's release date will change.
As a prequel, Batman is expected to encounter many of his rogue's galleria for the first time including Deathstroke, and there is the suggestion that Batman will reflect a younger, less refined cape crusader. "We have eight of the best assassins in the world who have come together to Gotham City for one night, Christmas Eve... to kill the Bat."
Eric Holmes is the project's creative director, who some may remember from his work on the first 'Prototype' and 'Gears of War 3.'
'Batman: Origins Blackgate' is being developed by Armature Studio for the 3DS and PS Vita. The gameplay is described as a 2.5D Metroidvania.