Here is the second CG episode created for Halo 4's Spartan Ops.
Halo 4 Spartan Ops Episode 8
The eighth CG episode is out for Halo 4: Spartan Ops.
Halo 4: Forward Unto Dawn - Episode 3
The third episode has been released for Halo 4: Forward Unto Dawn.
Halo 4 - Developer Showcase
The developers at 343 Industries discuss the upcoming Halo 4 shooter game.