Visit www.halo3.com starting 12/4 to sign up for the Beta.....
In addition, the new Halo 3 ad will debut on Monday night football On ESPN between 5:50 and 6:20 p.m. PST (8:50 - 9:20 EST) to catch the stunning new look at Halo 3. If you miss it, the ad will also be airing on Xbox.com at 8:00 p.m. PST (11:00 p.m. EST).
Oh yeah, one more little item is this new Hi res photo in the related photos: