There's a mix of beautiful CG and gameplay in this trailer for Halo 4's multiplayer experience, Spartan Ops.
Szymon Biernacki's Concept Art for Halo 4: Spartan Ops
Here's some of the concept art work created by Szymon Biernacki for Halo 4: Spartan Ops.
Halo 4: Spartan Ops - Episode 4
The fourth CG episode is out for Halo 4: Spartan Ops.
Halo 4 - CG Intro
Digic Pictures have created this CG intro for Halo 4's single player campaign.