Crew members deaths.

Hello everybody, long time lurker here. It's so great to finally kick in active discussion. I had one concern recently, so I'm eager to share it with you guys and ask what you think. Beware, there are heavy spoilers ahead, DO NOT read if you don't want to be spoiled. So, my concern is about how much the trailers show off about the movie's plot, especially about some lethal casualties of the Prometheus crew members. It is pretty safe to assume now about how some characters would die in a movie: 1) Cpt. Janek, Ravel and Chance. Sacrificing themselves during the suicide run. 2) Holloway. Incinerated by Vickers. 3) David. Lying in the hologram room without a head, probably deactivated. 4) Milburn. Died/mutated from the cobra snake. 5) Fifield. When became a mutant, practically dead already. 6) Vickers. Probably smashed by a Juggernaut(God I hope that not true). 7) Couple of mercs and mechanics killed by infected crew member(s). So, in your opinion, does these all trailers spoiled us too much? Or all of this is just masterly planned plot rabbit whole, developed by trailer makers to distract fans?