YouTube user SFlip has discovered what looks like Batgirl DLC for Injustice: Gods Among Us, the DC Comics fighter by NetherRealm Studios. In the video below, spotted by Polygon and GameInformer.com, you can see the Batgirl DLC listed on the Xbox Live Marketplace:
Warner Bros. announced some time ago that Injustice would have at least four DLC characters. The first of these is Lobo. The other three have yet to be announced, but it looks like Batgirl may be one of them.