Rumour: Batman on XBLA?

The first rumours of a downloadable Batman title called {Batman: Impostors} (or Gotham City Impostors), specifically heading to Xbox Live Arcade, came back in February when it was mentioned by retailers (quickly removed), and now @Supererogatory has found more evidence as Warner Bros has registered three new domains - BatmanImpostors.com, BatmanRedHoods.com samt BatmanHushGame.com. At this point very little else is known, could it be a simple promotional game (such as {Dead Space: Ignition}) or a proper XBLA release. Is it also coming for PSN and PC, or is it some kind of exclusivity.