The third episode has been released for Halo 4: Forward Unto Dawn.
Halo 4 Spartan Ops Episode 8
The eighth CG episode is out for Halo 4: Spartan Ops.
Halo 4 Trailer VFX Breakdowns by Method Studios
Method Studios do VFX breakdowns of several scenes from their recent cinematic trailer for Halo 4.
Halo 4 - Composing Worlds
This developer video for Halo 4 shows how the musical score was created for the upcoming sci-fi game.