Expect new story DLC for Batman: Arkham City which features Harley Quinn and Robin, according to details gathered from leaked PlayStation 3 trophies.
Robin appears to be a playable character in the new content, having already been seen as a pre-order bonus and downloadable character for the main game.
The full Harley Quinn DLC Trophies (via PS3Trophies):
- Lost Property [Bronze] - No crimefighter should be without this
- Breaking and Entering [Bronze] - Find a way into the secret base
- How's It Hanging? [Silver] - Clean up the Dry Docks
- The Last Laugh [Silver] - The joke's on who?
- Frequent Flyer [Bronze] - Zip Kick 3 different thugs
- Battering Ram [Bronze] - Shield Bash 5 different thugs
- Snap To It [Bronze] - Snap Flash an unarmed thug, an armed thug, an environmental object and a Titan
- Bomb Squad [Bronze] - Defuse all bombs in 3 minutes or less
- A Few New Tricks [Bronze] - Use 5 different Quickfire gadgets in one fight as Robin in Harley Quinn's Revenge
- Party's Over [Silver] - Destroy all Harley Balloons
Harley Quinn DLC follows day-one Catwoman content, plus Robin and Nightwing Challenge mode additions.