343 Industries has provided a new roadmap for Halo Infinite that notes Forge and Campaign co-op will arrive in November with the winter update.
On the same day, Campaign co-op and mission replay will go live, two new maps (Detachment and Argyle) will also arrive, and the free 30-tier Battle Pass will become available.
Forge will be available in beta form on November 8.
Forge allows you to build maps using a special editor, and you can share your creations with other players.