While the trailer itself provides few concrete details, the description of the trailer on Xbox Live Marketplace reads, "High action and deep mystery await players in this new Halo 3 campaign experience. Prepare to drop." Footage in the trailer show bombs and pods being dropped on a city believed to be New Mombasa, a recurring locale in the Halo series.
In April, rumors swirled that Bungie was working on a Halo spin-off title for Microsoft. According to these rumors, this product was to be a series prequel that told the story of early conflicts between the Covenant and the Orbital Drop Shock Trooper Special Forces unit.