Based on everything the devs have talked about and all the interviews and first impressions with the game at this point in its dev process, it sounds like an interactive version of Alien. For me, a huge fan of the first film, who thinks that as a horror film, Alien does it much better than Aliens in that regard, this is like a dream come true. I still think the demo is little more than a peripheral first glance at an incomplete game, but even so, it looks great and you can tell they've really done their homework in regards to the look an sound of the game. If the demo makes anything clear, it's this. In regards to the gameplay and the plot, I think it's to o early to say and they might keep that under wraps until October. Can't say I blame them. You want people to be surprised, but at the same time, given the supposed random nature of the Alien's behavior, it will be impossible to predict. You'll only know its intent, but that first response to the game upon release is important all the same.
Regardless of how they handle it -- official demo or no, in-depth accounts of the plot, characters and story or not -- I think the game will gain tremendous respect among Alien fans overnight, but will be more to slow to come around to people who have been raised on nothing but Aliens. It's an annoying trend how much people love Aliens, and I hope if anything that this game breaks that and shows people the first first is just as strong, if not stronger, in its own right.