Batman: Arkham Origins – Blackgate 3DS (the handheld companion to Origins on consoles) won’t be releasing in Japan.
However, Blackgate is still coming out in Japan but for some reason Warner Brothers decided that only the PS Vita should be released there. There has been no announcement what so ever regarding any 3DS releases in Japan.
In relevant news, all versions of Batman: Arkham Origins (console and portable) have been dated for Japan. The title will be out on December 5. Warner Bros. will be making Deathstroke DLC available to players on Wii U, PlayStation 3, and Xbox 360 as a limited bonus.
ArkhamVerse discusses this issue a bit deeper. Go here to check what they have to say regarding Nintendo’s influence being on the decline and more.