A small teaser trailer for Quake 4 (allegedly from the Xbox 360) has been released, showing off a few seconds of footage.
.. and from GamersHell: As promised, Microsoft, during the MTV Presents: The Next Generation Xbox Revealed show hosted by Elijah Wood, officially unveiled Xbox 360 along with many games which will be released for this new console: Ghost Recon 3, Call of Duty 2, Quake 4, Need for Speed: Most Wanted, The Darkness and many more. Check the links for Press Release, several images, and two fact sheets. (XBox 360 Fact Sheet, Peripherals Fact Sheet)
Video: Quake IV Teaser Trailer 1.49MB (.wmv format)
News source: AusGamers