ENTHUSIASM! Those clever folks at Bioware have been able to explain what's going on with Mass Effect 3's new multiplayer (including some kind of drop-in and drop-out co-op mode) via a new move-o-screen presentation which is delivered via "Bioware Pulse", and contains considerable enthusiasm for the idea of Bioware games. And why wouldn't it? They're quite literally some games you can play, if you want.
Video! Below! NOW!