David in the Engineer cloak at a temple

Scale wise they look the size of humans.

Did you notice the as above so below pyramid cloak and shadow?

They look human sized, but, they also seem to have shiny, bald heads, like the engineer from Prometheus.

For me this is the money shot from the trailer, it captures the scale of 'more than likely' Davids actions.

All the ingredients were there for him to carry this out

His programming, his motivations ( his creator dead and head ripped of by the Engineers) his imutity from the goo, his inquisitive nature to tamper and his durability 

Head back on, use of shaw as he sees fit and unleash the goo on his arrival

Spend the next 10 years tampering 

The building at the top looks like the installation in prometheus, same builders?

david gets his body back? Shaw must help him, or he takes shaws body? I cant see the engineers being able to help him if they've been neutron bombed.

just read that in the film, david resides in the hall of heads, an engineer temple where they store knowledge. Would the engineers really hand it over and leave david to it? Could be he takes over once they are extinct. The goo doesnt affect david, hes the only entity on the planet.

just read that ridley scott alludes to the engineers not being human creators, are they just enemies who want to destroy humans and they themselves are intercepted before they can get us?

This is my favourite shot of the trailer. I think these are all engineers. Probably they all lived before David arrived. He built is own lab and did experiments with the biological weapons there and wiped the engineers all out. To go to the lifeform which created the engineers. Maybe thats what in the temple?

Why and when does David go there? What is in there?

...I hope the last scene of the trailer doesn't also appear in the last part of the film... I hope that there a much bigger finale than an alien chasing the crew... 

Is this the same temple? Probably yes

Great screen grabs 123Engineer. 

Okay. Say he does clean the Engineers clock by some fantastical means....The question remains is "Why?"

I don't see a purpose of wantonly killing that many individuals when it would be more fun to experiment on them.

Just my two cents worth...

I'm leaning more towards the inhabitants being wiped out in an ancient event, but David was beheaded by the Engineers, plus he has the knowledge of how the goo / Juggernaut tech works, add in zero remorse and it is possible that he nuked the place when he arrived or when he crash landed

Just my threpence

I think it is either an apocalyptic event or some sort of genocide that destroyed the engineers like @Tropics is saying. Why would they have let David even be there if they were still alive? Wouldn't they have just killed him? They sure as hell wouldn't have let him create something to destroy them. So was he hiding the whole time with Shaw and planning to wipe them out? I just don't see that. And that's just my opinion and I might be completely wrong.

maybe every few decades or so the planetoid gets hit by a gamma ray beam, neutron star close by or something even the engineers cant control or prevent.

i cant imagine which weapon that fits into the arsenal and capabilities of them so far would fry an entire planet and only the organic life forms.

DCC and Su'd -  imagine seeing David goo nuking the Planet in his Juggernaut on the big screen!? However this doesn't quite match Weylands instructions of try harder!

If it's not an ancient event, it's more likely a crash spill accident 

123 that is the same temple, someone earlier posted a drop ship shot and you could see all the bodies 

@Tropics  Yeah I have to admit that would be epically spectacular! I have a feeling I'm gonna be wrong about him though and maybe he is capable of all these terrible things people are thinking he does.

@inquistor

Neutron bombs and other Neutronic devices do exactly that. Emit deadly radiation that destroys tissue and burns flesh while minimizing damage to physical structures.

You've got to take care of the important stuff first.

However it happened the implication is that it was a "no survivors" event. Any survivors would have cleared the bodies. 

While the bodies looked burned, all the structures look intact. Like intense radiation bombardment with no explosives. Like they got microwaved.

That 2nd screenshot above with david walking through the temple, the figure in the bottom right looks like an engineer to me, whiteish skin, bald head and it looks like they are wearing an engineer suit.

David used to wear clothes to put humans at rest with his presence in Prometheus. At this stage, why bother wearing a bath robe? Pockets?

Adam / Dk - So you feel this could be the aftermath of an ancient event and the figure is not David but one of the cloaked Engineers we see at the start of Prom?

You could actually see this happening at the beginning of the film tbf....

Goddamn Tropics in here not disagreeing. I was only pointing out that he wore clothes to put others at ease but wouldn't require that need at this point- maybe he learned about the human notion of modesty and self awareness? Just saying......could very well be at the start of the film.

David (androids) are built to serve humans and they're endeavours.  He infects Holliday due to weyland's instructions, transports Shaw because of her  instructions. At what point are his actions dictated by his OWN decisions and interests, and not others'.  Or is he even capable of this? Have we assumed too much.....or his he still acting on the direction of his programming or new master?