Konami had already announced that MGSV would expand with a free multiplayer mode, and today it goes live for all consoles. Meanwhile the PC version is still set for a January release.
The mode is entirely free and will be patched into the game when you boot it up today. You can get to it through the main menu in The Phantom Pain.
FOB is also getting updated today with some new missions and other features.
Collectors Edition DLC is also releasing today including bonus XP and weapons.
While the release states that the content is avaiilable today, it is being noted by user that the update is rolling out in stages. The US can expect to see it go live around 3PM, probably the same time that console stores update.