Bungie: "As we all get closer to the first map pack – the Heroic pack - we get closer to what will obviously be a better, more varied game of Halo. There are a few things that pop up when discussing this, so I will clarify those immediately. You can play the DLC maps in their own playlist almost immediately – so no waiting for a Playlist update for weeks and weeks. You can continue to play boxes with and without the DLC maps in a LAN setting. In most ways, this should be the smoothest DLC we've ever made. Fingers crossed."