I haven't been this excited about a new movie since Black Swan. Or Jackass 2. Seriously though, it's marked on my calendar, which I never do with movies.
My fear: I hope it's more than just "aliens came to Earth long ago, put some heiroglyphs around as a message, and use our ability to travel in space as a marker to exterminate us!" That's been done, many times.
Maybe it's just that this theme has never been done well in a film. And that's a problem of the medium itself that even Maestro Scott can't overcome: to communicate complex and/or novel ideas, you need lots of exposition, which you really can't do in film, unless you have a Star Wars style crawl that lasts 20 minutes or an Ayn Rand type info-dump. Of course when you're watching a movie, the satisfaction is much more in the presentation. Giger contributed, but the alien itself (the big one, not the face-huggers) will not make an appearance.
I will leave my high expectations in place. Dammit, this is the prequel to Alien.