Unless there's a secret second Batman game in the works for the 3DS, the Batman 3DS (working title) would be the game that was announced as Batman: Arkham Origins Blackgate, and should be deleted as a duplicate.
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@def: So it's a nearly 3 year old pre-launch announcement for which there has been no updates since, and no info in general beyond a generic title? I'd say either the project got canceled, or it got stuck in pre-production and eventually turned into Blackgate. Anyway, I guess it's up to the mods whether it stays, but personally, as things stand now I think it's better of as a line on the 3DS wiki page than it's own wiki entry.
@blacklagoon: Pretty much. Though I'd say mentioning it on the Blackgate page makes more sense than on the 3DS platform page.
To be fair though, Resident Evil Portable's page still exists. Not much has been said about that game as well since it's E3 2009 announcement. I think the Batman 3DS page should just get a paragraph about its status as vaporware/cancellation.
Armature has been working on Blackgate since Spring 2012 (source: http://www.gameinformer.com/b/features/archive/2013/04/19/batman-meets-metroid-in-arkham-origins-sister-game.aspx) so I think whatever happens with this page, I think it is clear that there is no relation between the two.