This appears to be a Vex unit standing in the Exclusion Zone on Mars. The green color seems to indicate factional association. Other shots showed green banners flying outside structures on Mars.

From comparing to the concept art shots we've already seen, this should be from the Exclusion Zone on Mars. Seeing it in-engine at least gives us an idea that Destiny is more than a huge collection of concept art, but has some locations that are already in the game.

This dark purple environment looks like a Covenant nightmare. This area, complete with its wildly spinning wreckage in the background, was also seen briefly during the ViDoc. Here we get a longer look, including an armed figure in the background left.

A short sequence in the video seems to show the sun almost directly overhead, perhaps to emphasize the idea that time will pass in this world, including day and night cycles.

A short sequence in the video seems to show the sun passing overhead, perhaps to emphasize the idea that time will pass in this world, including day and night cycles.

A pretty sky shot. It would probably be going to far to wonder if the cataclysmic events that wiped out nearly all of humanity affected the atmosphere in such a way that made aurora borealis more common.

Another shot that hints at Destiny either being still pretty incomplete, or Bungie being especially secretive. Before we couldn't see what the characters were shooting at; now it appears there was nothing there to shoot at, as bullets bounce off the floor.

Here we can so both characters ahead of the player open fire on something around the corner that cannot be seen. None of the shots seem to land; in the next frame, they seem to harmlessly bounce off the floor.

It's hard not to look at the geometry and color scheme of this area and not be reminded of the Covenant hangar bays from Halo 1.

Here we can see the actual muzzle flash from the weapon. Both characters seem to be carrying rifles, but of different types.

In the background we can see things that looks like chrysalis of some sort, hanging from the ceiling. They're visible in many shots during this short trailer.

Here's the first shot we see fired in Destiny, although the player's weapon blocks direct view of it, we can see the muzzle flash on the floor.