The third episode has been released for Halo 4: Forward Unto Dawn.
Halo 4: Spartan Ops - Episode 9 Trailer
A trailer is out for the next CG episode of Halo 4: Spartan Ops.
Halo 4: Forward Unto Dawn - Episode 2
Here's the second episode of Halo 4: Forward Unto Dawn.
Halo 4 - Composing Worlds
This developer video for Halo 4 shows how the musical score was created for the upcoming sci-fi game.