The fourth CG episode is out for Halo 4: Spartan Ops.
Halo: The Master Chief Collection - CG Trailer
Master Chief nukes some Covenant in this CG trailer for Halo: The Master Chief Collection.
Halo 4 - Spartan Ops Episode 6
The sixth CG episode of Halo 4: Spartan Ops is now out.
Halo 4 Spartan Ops - Episode 2
Here is the second CG episode created for Halo 4's Spartan Ops.