From the PlanetXbox360.com feature article (with images):
"For those of you who were able to see what little footage was shown at Spike's VGA show this past Saturday, you would have noticed the new in-game engine trailer from Halo: Reach, which is slated for release Fall 2010 essentially keeping all of us Halo fanboys in tight-knit stitches until at least the beta is available Spring next year. In the meantime, the trailer will have to do and while it isn't perfect by any stretch of the imagination, there are some definite indications that what we're getting here is something new and exciting. If you haven't already seen the trailer in complete form make sure to watch it before reading the rest of this article. Thus, without further delay, I present a dissertation with included screenshots of the latest Halo: Reach trailer."