Alongside the usual addition of a new weapon and store skins, there are a variety of new maps for Modern Warfare 3, as well as The Haunting, Call of Duty's annual Halloween event.
Based on previous seasons, expect the update to roll out around 24 hours ahead of the above times on Tuesday.
For Modern Warfare 3 and Warzone, you can expect the following additions at launch, unless otherwise stated:
To "celebrate the final season" and as a "thank you" to players, schematics will now recover twice as quickly, while Operators will be able to access Free Dark Aether Rift Runs without needing to first offer up a Sigil, according to Activision.