Check out Polynoid's beautiful VFX work for Halo 4: Forward Unto Dawn's opening.
Halo 2: Anniversary - Cinematic Trailer
Take a first look at the overhauled Halo 2: Anniversary cut-scenes in this trailer from Blur Studio.
Halo 4 Spartan Ops - Episode 2
Here is the second CG episode created for Halo 4's 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.