When we say "tease," we really mean it. "Forward Unto Dawn" is the live action series that's going to setup the events of the upcoming Halo 4 and give additional context to the generation-spanning story of the human-versus-Covenant conflict. That piece of Halo 4 sci-fi, along with the generous Spartan Ops offering, take this experience far beyond the typical video game launch.
Be warned though: you're not going to learn jack squat about Halo 4, "Forward Unto Dawn" or anything else after watching this teaser trailer. We're talking Katy Perry-caliber teasing with this one.