As reported in the latest community update on Halo Waypoint, we should soon be seeing the next big update for Halo: The Master Chief Collection. This will include the Halo 3: ODST campaign in addition to a remake of the map Relic which is to be now called Remnant.
In addition, playlist changes have rolled out now that will make the SWAT playlist a permanent fixture and additional maps have been added to the playlist rotations. Work continues on getting 8v8 Big Team Battle working in matchmaking.
Recent experiences with multiplayer have shown that good progress has been made in overcoming many of the issues. However custom games can still cause grief with network performance which is something I’m hoping to see get rectified in future updates.
For more details, go here.