When I first read about it, it sounds Assassin's Creed-y, but totally different companies. Arkham would at least be under the same distributor.
Speaking of Assassin's Creed, Ubisoft is getting deservedly tarred and feathered over the internet for the whole "women are too hard to animate" thing. I'm not sure why they even started this unless it was to get some publicity for Unity, considering that franchise isn't as popular as it used to be. I wouldn't think it'd be hard to throw in a female assassin model considering they make so many for the multi-player anyway. This really reeks of a publicity stunt--get people pissed all of a sudden, then give them what they wanted and the game got some free attention, more than it would have if they had done it without the drama.
That said, it's way too much fun making fun of them, like the Frozen animators' bitching about it being too hard to design different female faces. Although they meant it, and for all I know, Ubisoft does too. I don't care; I'm done with that series except for eventually buying the pirate one when it gets down to $15 or something, and that's not for the assassin parts.