When Batman: Arkham City was first announced, we knew Catwoman would play a major role. It wasn't until today that we learned just how big of a role she would play. GameSpot got a sneak peak at what Warner Brothers Interactive and Rocksteady will be showcasing at E3 next week, with the big unveil being that Catwoman will be a playable character! Rocksteady's Dax Ginn told GameSpot that the Catwoman narrative will account for only 10% of the main storyline, but you can level her up (so you can upgrade moves and gadgets), take on side missions, and use her to collect some Riddler trophies that only she'll be able to access.
Most importantly, playing as Catwoman will feel like a unique experience - the team didn't want players to simply feel like they were controlling a reskinned Batman. She's quicker and lighter on her feet, has her own special moves and gadgets, and because she lacks a cape and grapple, takes a more physical approach to traversing the city, using parkour moves, her whip, and even climbing on ceilings for stealth. In addition, whereas Batman has his detective vision, Catwoman will have thief vision. Engaging thief vision will highlight what you need to steal, as well as relevant points that will help you steal it.
It may be over four months until we get to play as the beloved feline, but in the mean time, you can enjoy this Catwoman Trailer below, highlighting some of what you can expect with her as a playable character.
In case the YouTube video gets yanked, you can also watch it over at GameSpot.