A sharp-eyed Darkman (yes, yes, you're a legend) posted on the HBO forum with a link to ZDNEt's Gamestock Halo report. It's got mounds of detailed info on gameplay, and two different X-Box Halo movies (this one I haven't seen before; first person to slap it up at RHL gets a hearty handshake), available in several different file types for your viewing pleasure. Go take a look.