I found the idea that Shaw (Naomi Rapace) had initially reassembled David (Michael Fassbinder) somewhat troubling, especially when you take into account the chaos that he had a hand in initiating–never mind the de-facto murder of Halloway (Logan Marshall-Green) though it’s not apparent that Shaw realizes that David was behind that.
Though it actually makes sense that she would repair David because the likelihood is great that she could not pilot the ship alone, and besides the idea of traveling to an Alien–literally and figuratively–with a talking, disembodied head would probably NOT be a great idea.
Besides, Shaw has journeyed light-years across space on the strength of her faith; on the chance that she might meet the people who literally engineered the Human species.
Compared to the wonders she’d seen, and the terrors she’s survived, repairing David is almost a no-brainer.
Though what’s most interesting about the trailer is toward the end, when the ship arrives in the Engineer homeworld and David says: ‘Look on my works, you Mighty, and despair!’
That’s a line from Perry Bysshe Shelly’s Ozymandias and while it’s uncertain how David means it, seeing that the poem revolves around a found remnant of a fallen empire, it doesn’t look good for the Engineers.