Here is the second CG episode created for Halo 4's Spartan Ops.
Halo 4: Spartan Ops - Episode 4
The fourth CG episode is out for 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.