Is Arkham City getting more DLC?

10 new trophy listings has appeared on Batman: Arkham City's PS3 Trophies' page, which hints at a possible new DLC pack.

Lost Property
No crimefighter should be without this
Breaking and Entering
Find a way into the secret base
How's It Hanging?
Clean up the Dry Docks
The Last Laugh
The joke's on who?
Frequent Flyer
Zip Kick 3 different thugs
Battering Ram
Shield Bash 5 different thugs
Snap To It
Snap Flash an unarmed thug, an armed thug, an environmental object and a Titan
Bomb Squad
Defuse all bombs in 3 minutes or less
A Few New Tricks
Use 5 different Quickfire gadgets in one fight as Robin in Harley Quinn's Revenge
Party's Over
Destroy all Harley Balloons

Tara Strong, the voice actor for Harley Quinn also announced in an Q&A at Sac Anime that she'll be bringing back Harley in an extension of the game. Here's hoping that Rocksteady will announce something very soon.