Steampunk and zombies?

Okay, this is going to be really vague.

Some time recently, I saw a video. I don't know if it was a commercial on TV or a video on youtube or a trailer for a game or a movie or anything. I completely forget. But I just remember that it had a group of like four or five victorian-era-clothing-clad men and women wandering through a densely misty city. They had guns that looked like old steampunk versions of more modern guns, and proceeded to use them to fight off a bunch of people (who may or may not have been zombies) closing in on them from the fog.

Anyway I just remembered this today and I can't find the video anywhere. Anybody else remember seeing it, or know what it's from?

Thanks