Arkham City story DLC may be a possibility

With more than 4 million shipped copies of Batman: Arkham City, odds are you’re still playing through the story for the first time, spending your nights hunting down those last few Riddler trophies, or even honing your combat skills in the challenge rooms. Rocksteady has already planned to add some additional characters to the game’s challenge modes, but hasn’t said anything about the possibility of releasing more story content as DLC. Until now.
In an interview with UK newspaper The Guardian (and pointed out by our sister site, CVG), Arkham City director Sefton Hill hints that there may be a chance of some expansion on the narrative. When asked by the paper if there would be any story-based DLC, he answered with a smile, saying, “I don’t think I’m allowed to talk about that at this stage.” That's not an outright no, so surely it must be a yes...right? Maybe?
Even though Hill doesn’t outright state that Rocksteady has some new DLC lined up for Arkham City, the prospect of getting more time as Batman is exciting enough for us. There are dozens of possibilities for where the content could go. They do have Robin and Nightwing character models built for the challenge maps, so perhaps we could see a little sidekick side-mission action.
What kind of additional story DLC would you like to see in Arkham City?