The fourth CG episode is out for Halo 4: Spartan Ops.
Halo Nightfall - First Trailer
The first trailer is out for the Halo Nightfall movie.
Halo 4: Spartan Ops - Episode 3
The third CG episode of Halo 4: Spartan Ops has been released.
Halo 4 Spartan Ops - Episode 2
Here is the second CG episode created for Halo 4's Spartan Ops.