User blog comment:James12708/New Multiplayer DLC/@comment-1362864-20120406210829/@comment-1388547-20120409014044

Hmm. I wouldn't be surprised to see these show up in single-player as missions at some point. The maps are already created, so it would be just a matter of setting up the single-player scenarios and recording a bit of mission-specific dialog. And they sneak the new guns into single-player too, if they wanted, either as something that's "been there all along" like most DLC weapons, or something that's found in the new missions.