The full trailer has been released for Halo 4: Forward Unto Dawn, an upcoming series taking place before Halo 4.
Halo 2: Anniversary - Remaking the Legend
See how 343 Industries have remade the legend of Halo 2 in this documentary video.
Halo 4: Spartan Ops - Episode 10
Here's the tenth episode of Halo 4: Spartan Ops, created by Axis Animation.
Making Halo 4 - Part 1 and 2
Join 343 Industries on a 20 minute behind the scenes featurette on the creation of Halo 4.