The lone fighter wont be so alone in his next outing, with NeoGAF reporting that the latest issue of PSM3 has revealed that Batman: Arkham City will feature a multiplayer of component of some sorts. Unfortunately the existence of said multiplayer component is all we know. It may be a series of side missions, it may be part of the main story, or it might be something else entirely.
We may hear more news regarding the multiplayer when Arkham City gets a gameplay reveal at the Spike VGA 2010 event this coming weekend. To pass the time between now and then, here's an Arkham City teaser video.