I found this floating around the Interweb today. It looks like it was part of the story board for the teaser. It also looks like the Forerunner Artifact from the H3 trailer is the Ark. I always suspected it to be Ark, as no doubt many fans did, but this seems to confirm it. Now this could also very easily be completely bogus, so don't get crazy.
Want to know what the the best selling Xbox 360 games of all time are? Well look no further, as we delve deep into this consoles' catalogue.