Maybe it's just me, but the more I hear, the more this sounds like a small scale side game rather than a full on AAA release. Kind of like that co-op Tomb Raider game from a few years back (which was OK for what it was), or that crap looking Ghostbusters game that nobody played.
If so then I'd suspect it'll be targeting mobile platforms primarily. Out of interest, is there any conformation that this is even set to be a console release?
Well the site for the game shows a picture of the various game cases for the PC, X-Box 360, PS3, WiiU, and releases of what I assume is the mobile game thing for the PSVita and 3DS. So looks like its a general release.
Also from the sounds of the game description you get to go through all of Gotham City this time.
Heres the link http://www.batmanarkhamorigins.com/