MBR's blog

As the one year anniversary mark fastly approaches for the king of all games, Halo 3, levels of suspicion among various Bungie fans have skyrocketed in the past 24 hours. Earlier today, a few members from the Bungie forums noticed the above popup notification while booting up Halo 3. Now, the above WASN'T supposed to be shown until tomorrow, but Halo fans (once again) got lucky, and went flying to Bungie.net in search of the teaser trailer. Upon visiting the Bungie homepage, the infamous Superintendent appears again, bearing a new countdown, which is set to expire at 7:07AM PST, on September 25th 2008. Although there is no confirmation on what will happen when the clock hits zero, most watchers can only assume that a new title will be revealed.

Source: Halo3Planet.com