The Batman brand has already become an incredible success with its second spin-off, 'Arkham City', as the current sales figures show.
A total of six million copies of the Dark Knight's latest adventure have been shipped since its release in October, as confirmed by Warner Interactive in its latest financial report.
Meanwhile there are Rumors, that Rocksteady is working on an adaptation of Teenage Mutant Ninja Turtles, which in this case will probably take a while.
Source: Eurogamer
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