Batman Arkham Asylum 2 Release Date?

What is the Release Date For Batman Arkham Asylum 2?
From the trailer it appears that The Joker and Harlequin have opened Arkham Asylum up and let the inmates run through the streets of Gotham causing all kinds of destruction chaos and mayhem. I saw it and it looks sick, can't wait for the release.
The clip shows a seriously ill Joker, who puts on a brave and crazy face for the camera - but is suffering from some sort of serious sickness.
Batman Arkham Asylum 2 is going to be a hit. What's the release date?

I wish there was a release date for Batman Arkham Asylum 2.
This is a surprise to me as well. Details are scant, but the new title looks to carry on where the critically acclaimed original left off, Batman seemingly up against arch nemesis The Joker once again. However, it will be Warner and not now Eidos owners Square Enix Europe that will publish Rocksteady’s sequel across the globe.
The trailer and web site proclaim that “Arkham has moved,” but it seems to me that what it really means is that the game has moved out of the claustrophobic, tight spaces of the asylum and has spilled out to new locations in and around the facility as well as in Gotham.
No release date yet.