I'm sorry, but I have to call this a total dodge. We already have multiplayer conversations, and have had from the very beginning so that is clearly not what Mr. Hood was talking about in the interview.
If you try to read it a bit more optimistically, however, it could just mean that some future content (let's call it Makeb for the moment) might get a more intermingled, coinciding overall story arc in the form of a planetary/bonus quest line that doesn't intervene with class stories. That would be cool.