That's exactly what I got from the trailers. Colin's reveal that this was a planet-wide infestation of aliens that had decimated all of humankind was a surprise reveal (to me, anyway). I think that's a significant spoiler to most (though spoilers don't bother me much, personally).
I would also concur that Colin's first paragraph summation included more information about the creatures than I'd gleaned from the trailers (which I saw many times). The trailers seemed to go out of their way to show as little, and tell as little, about them as possible other than they hunt by...