The action ramps up in episode 4 of Halo 4: Forward Unto Dawn.
Halo 4: Forward Unto Dawn - Episode 3
The third episode has been released for Halo 4: Forward Unto Dawn.
Making Halo 4 - Part 1 and 2
Join 343 Industries on a 20 minute behind the scenes featurette on the creation of Halo 4.
Halo 4 Trailer VFX Breakdowns by Method Studios
Method Studios do VFX breakdowns of several scenes from their recent cinematic trailer for Halo 4.