At an E3 2011 behind the scenes demo, CVG asked a rep how much of Arkham City would be played as Catwoman. He said: “It’s a substantial portion of the game. You’ll control her for around ten per cent of the time of Arkham City’s story.”
Catwoman will play with a slightly different and more acrobatic control system to Batman. Her story will be “interwoven” with Batman’s throughout the game.