Prepping for tomorrow’s release of the Descent expansion on PlayStation 4, Call of Duty: Black Ops 3 update 1.13 is now available to download on PS4 and Xbox One.
Reportedly a 1.14GB download on PS4 and 1.6GB on Xbox One, update 1.13 adds support for the Descent content, the new Fracture game mode, the PSN Play Together feature, and more, as the patch notes reveal:

Global
Descent DLC 3 Map Pack Support

Multiplayer Maps: Empire, Cryogen, Berserk, and Rumble.
Zombies: Gorod Krovi

Groups

Players can now invite Players to a Group by searching for their Player ID.
Added a ?Republish to Group? button in Players? Showcases to easily re-publish content to any Groups joined after the content was created.
Increased maximum Group membership to 100,000 players. Updated Recent Public Groups and Friends Group to display whether or not the Group requires a Join Request (Public) or Group Invite (Private).
When searching through Friends? Groups, Players will now be able to view which of their friends belong to the listed Groups.

PS4 Play Together

1st party functionality to support the PSN Play together feature.  Allows players in a PSN party to send an invite to all players in their party.

In-Game Store

COD Points are now available for purchase for the JP territory.
Removed DLC 2 pre-order and Infinite Warfare pre-order (for JP only) from the In-Game Store.

Multiplayer

Fracture (New Game Mode)

Pick up core files dropped by fallen enemies and deliver them to the fracture ...