Check out Polynoid's beautiful VFX work for Halo 4: Forward Unto Dawn's opening.
Halo 2 Anniversary - Cinematic Launch Trailer
Here is the cinematic launch trailer for Halo 2 Anniversary, featuring CG by Blur Studio.
Halo 4: Spartan Ops - Episode 5
Here is the fifth CG episode of Halo 4: Spartan Ops, created by Axis Animation.
Halo 4 - CG Intro
Digic Pictures have created this CG intro for Halo 4's single player campaign.