In the just-released teaser trailer shown below, we see the film's title gradually emerging in a way similar to the Alien trailer, a chamber full of pods similar to Facehugger eggs, an astronaut being attacked in a manner very similar to a Facehugger attack that got John Hurt's character G.W. Kane in Alien, and the giant alien "space jockey" found sitting in a chair in Alien. If Prometheus isn't a direct prequel to Alien, it certainly seems to share the same fictional universe.
Prometheus is scheduled to arrive in theaters on June 8, 2012 and stars Michael Fassbender, Charlize Theron, Idris Elba and Noomi Rapace. Let's see how many of their characters, if any, actually make it to the end.