Real World EventsEdit
- March: The first Halo figures by McFarlane Toys were released.
- April 15: The Legendary Map Pack for Halo 3 was released.
- July 14: The Five Long Years Cinematic trailer for Halo Wars was shown at E3 2008.
- July 15: An apology message about the postponing of the announcement of Bungie's new project, which was to be shown at E3, was posted at Bungie.net. The project would later be revealed as Halo 3: ODST.
- August 13: Issue 3 of the Halo: Uprising comic book series was released.
- September 25: The "Keep It Clean" trailer for Halo 3: ODST was released.
- October 8: Halo 3: ODST, then called "Halo 3: Recon", was officially announced at Tokyo Game Show 2008.
- November 25: The Art of Halo 3 was released.