The new Halo 3 trailer is available now, from the internet. It's also on Marketplace, which allows you to watch it on your television, through your Xbox. Ah hah. I can be wry.
It's pretty good. It's all CG, but does a pretty good job of getting the adrenalin going. Still, it doesn't match up to the sheer, ridiculous majesty of the halo 2 trailer.
The Halo music alone can reduce me to a quivering wreck of excitement and shame.