- February 17: The Forge Leader DLC for Halo Wars 2 was released for free, ahead of the Halo Wars 2 release.
- February 21: Halo Wars 2 was released.
- February 22: Halo Wars: Definitive Edition was fully released and henceforth available separately from the Halo Wars 2: Ultimate Edition.
- March 20:
- May 22: The Sergeant Johnson Leader DLC for Halo Wars 2 was released.
- June 13: The Halo Wars 2 expansion Awakening the Nightmare is officially revealed, alongside the next two Leader DLCs; Jerome-092 and Arbiter Ripa 'Moramee.
- June 21: The Icons of War DLC containing Commander Jerome and The Arbiter Leader Packs for Halo Wars 2 was released.
- August: The Yapyap the Destroyer Leader DLC for Halo Wars 2 will be released.
- August 2: Halo: Rise of Atriox Issue #1 will be released.
- August 29: Halo: Retribution will be released.
- November 14: Halo: Legacy of Onyx will be released.