Microsoft saved the big shot for last and just announced Halo 3 exclusively for the Xbox 360 and showed a teaser trailer at the Microsoft Press Conference at the Electronic Entertainment Expo.

According to Bungie.net Halo 3 will be the third and final game in the Halo Trilogy.

The trailer is available for download at Bungie.net and in full high-definition via Xbox Live. The entire trailer is rendered in real-time on the Xbox 360 using the current version of the Halo 3 engine.

"The trailer was built to have minimum impact on the development process, and while it required long hours and hard work from many, many Bungie staffers, it utilizes real-game assets, fiction and locations from parts of the 'real' game."