It was bound to happen, but Titan officially announced a new, city-themed map at PAX called New Pork, and says this is just the beginning.

looks cool hope i don't have to pay for it

Cool, I sort of expected this when you select the game in the XMB, they show some screenshots or concept art in the background and one included a town or city themed map.

If you care to see it in motion, here's a video:

Well, the map is awesome and all, but my only issue is that the game has a ton of maps already. I didn't really think it needed more maps. I'm not saying i am against there being more, but i'd rather see them expand the gameplay depth, maybe add another level to each class, or add more customization options, things like that. Rather then focus on adding more maps.
 
... But, based on the above video, it sounds like there is a lot of unannounced things in the pipes. So maybe we'll be seeing some of the things i mentioned. /shrug