Knowing nothing about the source material, I'm kinda shocked at how tense and creepy the whole thing looks. Obviously there will be action and adventure, but the prevailing mood seems to be dread and horror. It's obviously a kick to see Harrison Ford playing a grizzled character role, and he certainly seems to have a pretty large part. It's nice to see Jon Favreau get his name on the trailer, as the poster merely said 'from the director of Iron Man'. This is obviously a pretty thorough tease, but it certainly gets the job done. The film feels like a genuine western that happens to involve aliens from outer space. After the last few days of kinda terrible trailers, this one stands out as a genuine triumph, both as a piece of marketing and as a stand-alone piece of art. So far, so good.