With Reach due for release in 5 weeks, Microsoft has begun to kick the PR train into high gear. Last week it was the announcement of Versus Firefight and Forge World at Comic-Con.. This week, a new campaign trailer titled "The Battle Begins" has been released which showcases typical Bungie cinematic flair.
You can also check out the trailer of Forge World from Comic-Con below (highly advised, it's awesome)
And the slightly less cool (at least to me) versus firefight mode
Halo Reach will be launching September 14th on the Xbox 360 and represent Bungie's farewell to the series that essentially made the Xbox.