Update:

The official Batman: Arkham City Twitter account has posted a new image along with a tweet that says "Don't worry. This is all part of my plan."

see deal Batman: Arkham City - Game of the Year Edition - PlayStation 3 $9.99 on Gamestop

Does this hint that a Batman: Arkham City Original story follows:

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A series of 10 previously-unseen Trophies on PS3 Trophies is hinting at a fresh instalment of DLC for Batman: Arkham City.The 10 Trophies for the alleged "Harley Quinn DLC" are listed below.No crimefighter should be without thisFind a way into the secret baseClean up the Dry DocksThe joke's on who?Zip Kick 3 different thugsShield Bash 5 different thugsSnap Flash an unarmed thug, an armed thug, an environmental object and a TitanDefuse all bombs in 3 minutes or lessUse 5 different Quickfire gadgets in one fight as Robin in Harley Quinn's RevengeDestroy all Harley BalloonsIn an interview published back in January on ComicBookMovie.com (following a Q&A panel at Sac Anime in Sacramento, California) it's claimed Harley Quinn voice actress Tara Strong hinted she'd be bringing bring Harley back in an extension to the game.Warner Bros. has declined comment.

Luke is Games Editor at IGN AU. You can chat to him on IGNor find him and the rest of the Australian team by joining the IGN Australia. Think fast, look alive and die hard!