User blog comment:TheUnknown285/Hints of Things to Come in the Last Few Multi-Player Announcements?/@comment-4950455-20120918024522/@comment-4950455-20120918062809

There are different teams working on MP and SP; it's why all that multiplayer DLC came out during the stretch when people were waiting for the Extended Cut. So I'd say it's entirely possible that there's two separate things in the works.