why on earth would they show this in the trailer

Because it raises the stakes of the story. Also because Joe Normie wants to go to a movie with explosions.

well that kind of reveals the ending

Maybe, maybe not. They've shown the Prometheus in flames in the teaser. Maybe it's the end of Act 2?

Explooooooosions by Michael Bayyyyyyy!

this has been in my mind for a long time as well but i think of it this way, how hopeless can it get before the ship witch is also the way home, does a kamikaze, is janek infected as well. also shaws lines ( there wont be a home to go back to) could mean they are somehow in the past and if the jockeys left they would destroy a ancient earth, so if prometheus did leave and somehow travel back to its original time earth would have been destroyed already,

So that people will want to go see the movie?

eh i think they are doing it to protect earth

Iis unfortunate they gave away as much as they did especially for the fan of the franchise wanting much of it to be unknown, but that's what they needed to show to the average viewer that's not a follower of the franchise. I do believe the studio is way smarter than to give away the true ending in their full trailer. There are still surprises in store for us, just be wary of info absorbed if the true fan truly wants to go in blind.

Okay, okay, okay! Here's what probably happens in the movie according to the way that the trailer suggests. The scene surrounding the kamikaze probably goes like this: Vickers is in the Prometheus while Shaw is out on the door in the ground. Shaw probably convinces Vickers to ram the Prometheus into the Derelict because "if we don't stop it, there won't be any home to go back to." Vickers finally agrees and sets Prometheus to collide with the Derelict and runs to an escape pod while putting her space suit on. The escape pod jettisons putting Vickers on the planet. Both Vickers and Shaw watch the Prometheus ram the Derelict and come crashing back to the planet toward them. Queue running and explosions. From there, maybe they still have to deal with the Engineer or possibly even David? We don't know yet!

That could work quite well Xenotron. In some previous clips we see Shaw looking at the derelict while it is standing upright arms reaching skyward and with no visible damage of any kind. This might be the craft taking off out of the pit and the shots where it is rolling are after it is knocked out of the sky.

That's what I put together using the trailer and Occam's Razor. The reason why I originally stated that it raises the stakes is because the situation has to be going so badly, that the crew is so desperate, that they'd [i]even consider[/i] ramming the Prometheus into the Derelict. That's what it suggests to the audience and that's why it's in the trailer. But, then again, maybe it is the end of the movie? Maybe Shaw and Vickers resign to their fate of being stranded with limited oxygen on an alien world? Game over, man. End credits. Who knows?

I think that it jacks prometheus up, but doesn't destroy it. It does, however, piss off the engineers so they try to take over the more space worthy vessel which is, ironically, the Prometheus.

I think you are right still. I think there is a lot going on after the derelict crashes. I do think it will allude to how the Engineer gets infected to explain a bit of what we see in Alien. Also it revealed Vickers to be a bit of a coward for not giving up her escape pod to someone else. Wasn't it explained that this whole mission was her baby and therefore the crew's lives were her responsibility.

Yeah there went my theory that the engineer chest busts in mid-flight, causing the crash... I agree we didn't really have to see the scene of prometheus clearly crashing into the derelict. Didn't give away anything major in the plot I'm sure but it didn't have to be so blatantly depicted in the trailer imho.

The Russian dude who claims to have edited the trailer said he didn't have the last 11 minutes to draw from, so that certain isn't the end. It's in a thread on avpgalaxy.net here I will find the quote: "This week, get down to treyleru "Prometheus", the film will be true without the last 11 minutes, but nevertheless I am not too upset, because if I go to the movies there must be some kind of intrigue." http://www.avpgalaxy.net/forum/index.php?topic=41929.0

its not the end of the movie since we see members of the crew on the ground running but still thats a pretty book plot point

Thanks, Shane, even more evidence! Since the teaser, when they show Shaw and Vickers running away from the Derelict crashing, I've been trying to imagine the "WELL, NOW WHAT?" moment after the dust finally settles.

I think there had been mention of the Prometheus crashing into the Jockey's ship since the set photo's leaked with debris scattered all over. Someone might have even leaked the info directly. I think they put that in cause they knew half of the hardcore fans already knew that was going to happen. At least I have this weird memory of lurking a thread on it before the trailer was released. Might have been around the time of the leaked trailer....

odd you would think pietro scalia would edit everything for this at ridleys request and supervision i'm sceptical . Also scott has ties with the mill who have done lots of in house effects and editing for ridleys rsa and films such as gladiator, and black hawk , hannibal, and kingdom of heaven.

The thread has more on his background. As I said, he is claiming to be doing it. I just posted it here because I have a feeling there is some truth for it. If the last 8-11 minutes has the DNA of the original "Alien" then leaving it out of the trailer makes complete sense. Have that there would be equal to "Luke I am you father".