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343 Industries will release a new Halo TMCC (The Master Chief Collection) content update later this week with improvements for various features of the game collection, including the much-needed support for matchmaking.
The newest update will include better support for general multiplayer (inc. improvements to party joining), general campaigns (inc. stat tracking for all games), general menu (inc. updates to user interface and menus), control layout, and stability (improvements for campaign and multiplayer).
Along with the updates, more fan-favorite playlists are in the works, with availability “in the near future.”
[Source]: Halo Waypoint: The Latest on Halo: The Master Chief Collection Content & Playlist Updates.