Today there’s a small content update for those logging onto the Halo 5: Guardians Multiplayer Beta. From Bravo on Halo Waypoint:
Happy New Year! The next time you log into the Halo 5: Guardians Multiplayer Beta, you will be prompted to download a small content update. This particular content update improves matchmaking by adjusting how the dedicated servers are selected.
The Master Chief Collection has also been updated to include the additional avatars and nameplates for those that have played the game before Dec 20th.