A long-awaited new trailer has appeared for Halo 3 on Xbox Live Marketplace.

The ad lasts 60 seconds and shows the Master Chief in some kind of kafuffle on our very own planet.

Those who have enough time on their hands have rewatched the trailer a few times over and promptly discussed online the possibility of whether a move the Master Chief performs is the much-anticipated X button attack.

A multiplayer beta has also been announced by Bungie, with sign-ups appearing online last night.