Halo 4 gameplay launch trailer

343 Industries has released a new gameplay trailer to prepare for the launch of Halo 4. While previous trailers focused on Master Chief and his development as a character, this one is more concerned with the ancient evil and the role of the Forerunners with regards to the story. Assuming the voice heard is that of The Didact, the Forerunner's most fearsome warrior may play a key role in the events that will soon unfold.