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While we already knew that Nightwing was coming to Arkham City Warner Bros. Interactive has now provided the first official details.

The company announced today that Nightwing will be available as downloadable content on both Xbox 360 and PlayStation 3. He'll come as part of the Nightwing Bundle pack, and includes "his own unique gadgets and special moves."The character will be compatible with all Arkham City challenge maps. The bundle will also include two new challenge maps, called Wayne Manor and Main Hall.The Nightwing Bundle Pack will be 560 Microsoft Points on Xbox LIVE and $6.99 on PlayStation Network. It will be available on November 1st on both platforms.Warner Bros. also added that a Robin Bundle Pack will be available separately on November 22nd. Batman: Arkham City hits stores on October 18th.