343 Industries put together a short video for the San Diego Comic Convention which showed us a little about how the upcoming Halo 4 is being made behind the scenes.
The trailer focuses on the developers, which includes the artists, writers, programmers and designers. It has not been released online as an individual video, but it will presumably be included in the Limited Edition of the game as a part of the "Making Of" feature. The video is an off-screen capture from SDCC.
In addition to showing us portions of how the game is being made, the video contains some never before scenes from Halo 4, which should be more than enough reason to watch it.
Halo 4 is set to return players into the role of Master Chief as he faces new enemies, called the Forerunners, on an alien planet completely hostile to human life. The game is out on November 6 this year, so keep your eyes out for it.