Arkham City DLC teased, Harely Quinn's Revenge

This teaser pic was just released today and, for those who have played the two Arkham games, it is easy to see that it's Harely Quinn holding a hammer weapon.

Considering how the second game ends [which will not be spoiled] this DLC could tell a short story of what happens after the events of Arkham City, in a way that may lead into the third game.

PS3Trophies.com also revealed the 10 trophies that you get from the DLC, one of which potentially reveals the possible name of the Harely Quinn DLC:

1. Lost Property: no crimefighter should be without this
2. Breaking and Entering: find a way into the secret base
3. How's it Hanging?: clean up the Dry Docks
4. the Last Laugh: the joke's on who?
5. Frequent Flyer: zip kick three different thugs
6. Battering ram: shield bash five different thugs
7. Snap to it: snap flash an unarmed thug, armed thug, environmental object and a titan
8. Bomb Squad: defuse all bombs in three minutes or less
9. a Few new Tricks: use five different quickfire gadgets in one fight as Robin in Harely Quinn's revenge
10. Party's over: destroy all Harely balloons

 So could "Harely Quinn's revenge" actually be the title of this DLC? Also, is it possibly that we'll now be able to play Robin in a story mode setting, as well as Night Wing perhaps? We'll have to wait for answers when the DLC is finally released. No release date was given but some hints point towards a June release, May if we're lucky.