The first trailer is out for the Halo Nightfall movie.
Halo 4: Spartan Ops - Episode 5
Here is the fifth CG episode of Halo 4: Spartan Ops, created by Axis Animation.
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.