If you are unfamiliar with the "Alien" films, for which "Prometheus" was long thought to be a prequel, Weyland-Yutani is the large corporation that owns the Nostromo and is ever vying to obtain and utilize the dangerous Xenomorph specimens. You can read more about it here, on this awesome Xenopedia site.
I am a huge "Alien" fan, so naturally, I think it's ingenious that a viral video promotion for "Prometheus" has been released in which Peter Weyland gives a TED talk. :)
The much-anticipated "Prometheus" comes out in June. If you haven't seen the trailer, you can watch it below. Now, I'm pretty sure I see the Space Jockey in there about 43 seconds in... If the Space Jockey is there, how is this not a prequel?? I think Mr. Scott may be trying to trick us... Whatever he's up to, it's gonna be hair-raising, and I'm all in. :)