Halo 5: Forge / Anvil’s Legacy Trailer
From Halopedia, the Halo wiki
The Halo 5: Forge / Anvil’s Legacy Trailer was a video created by 343 Industries to announce the new Anvil's Legacy update for Halo 5: Guardians, and the release of Halo 5: Forge and the Halo app on the Microsoft Store. It was released alongside the updates and releases on September 8, 2016. There is no dialog in the video other than text on the screen.