Mendicate Bias on 13 December 2009
It wasn't meant to be a trailer, it was the opening cutscene. Bungie specifically went out of their way to say this was in game graphics so I for one am absolutely impressed by what I saw.
For those people asking, none of those spartans was the MC. I don't even think they were Spartan II's although I may be wrong on that.
The definitive evidence that video games turn people into mass murderers
