So another thing I noticed that I found interesting was this scene in the new trailer;
It's obviously some kind of 3d model of a Derelict-type craft, which is pretty neat in itself, but what I noticed that's particularly interesting is that I think that it also shows crew members location inside the ship itself, displayed as small yellow graphics. I've highlighted their location in this pic;
Now, if that is a representation of crew members inside the craft, what it must mean is that in Alien, the egg silo that Kane is lowered into is not part of the ship itself, but is rather some kind of cave complex that the derelict is sitting atop.
There could, of course, be different sizes and functions of derelict-design craft, some being larger transport vessels, and some being smaller multi-purpose craft, but given that they appear outwardly identical, I think that that's unlikely.