I think that's it. That's why I'm not as excited for this. Alien and Aliens are both really claustrophobic and isolated. I don't get that same feeling from this movie. Although, it may end up being that way, I don't get that sense from this trailer. It looks like they took elements from Prometheus and added in a couple elements from Aliens, but with a lot more outdoor stuff. But we shall see.
Well, they are bringing the gap between Prometheus and Alien, so I'm good with that kind of sensibility.
As to the claustrophobic nature of the Alien films, it looks like a lot of that is still there with the Xenomorph running all over the ship. The terror still seems to be there, but the outdoors scenes are seeming to bring in the foreboding desolation of Prometheus.
Something intriguing was in that trailer as well: Specifically, the mention of wheat growing on this alien world.
Makes me wonder if the planet they are on is a game preserve used by the Yautja for their hunts.