Batman Arkham City is already out, but if you're looking to using Dick Grayson as the main character, then you can get a sneak peek of what Rocksteady is offering with the Nightwing for Arkham City trailer.
I grew up with Dick Grayson as Robin, who eventually turned into the badass known as Nightwing, so I was happy to see him get his own spot. Much like the previous trailers, the clip depicts the vigilante in action taking on multiple opponents while explaining the abilities he has in the game. The Nightwing for Arkham City also reveals that you can choose the animated series version of the character as a substitute for the more modern look.
If you're looking forward to using Nightwing, look for this game pack on November 1st, 2011.