Arkham Asylum 2 has been revealed as Batman: Arkham City, via the cover of US mag Game Informer.
"Almost exactly a year ago, Batman: Arkham Asylum launched to wide acclaim and millions in sales. Now, developer Rocksteady Studios returns to the the franchise that put the company's name on the map to blow away gamers all over again," the mag writes.
As we previously revealed, Arkham City is also set to appear in Official Xbox Magazine and Official PlayStation Magazine.
As you can see, the first images reveal Cat Woman as a main villain in the sequel (though we reckon should could even be a co-op partner), though we already know via leaks that Mr. Freeze and Two-Face are also set to appear.
Following the GI reveal Developer Rocksteady piped up to release the first Arkham City story details - hit the link for a read.
Earlier this year Rocksteady promised its sequel "won't let anyone down," and "we really want to surprise people again."
It's just been confirmed by another source that the follow-up will release in Autumn 2011, so we've still go a little ways to go yet.