Me too, 4 more hours to go!
But man does this movie entertain me!
Yes, definetly that part of the reasons for them to put us here to whipe us later on don´t have much sense.
But what seems possible is that this goo contained in the urns is going to be mixed with humans and then create their perfect destructive machine, the Alien as we know. And maybe also that some of the humans are able to stop th SJ in his way to earth to deliver the eggs..
Oh well, is only guessing, but is so wonderfull