Ok, so this isn't the prequel to Alien, we know that. After watching the trailer, you can't help but think of the classic series. Ridley Scott has a stellar cast attached to the project: Michael Fassbender, Charlize Theron, Noomi Rapace, and Idris Elba
Here's the official synopsis for the movie from the Apple trailer page, and the video is below. Enjoy.
Ridley Scott, director of "Alien" and "Blade Runner," returns to the genre he helped define. With PROMETHEUS, he creates a groundbreaking mythology, in which a team of explorers discover a clue to the origins of mankind on Earth, leading them on a thrilling journey to the darkest corners of the universe. There, they must fight a terrifying battle to save the future of the human race.