Finished reading through the RPG corebook completely so my sights are now on Making of Aliens! I read through the first chapter last night/this morning and I'm already really please. Some good pre-Aliens setup with Jim, Gale and Bill, but also, and this is one of those "what new stuff can you possibly show me?" moments.
Remember the document that Hill and Giler handed Cameron after their meeting, where "some bullshit happens"? Rinzler actually dug that up! It's not the full 5 page in here, but the one page synopsis. And it's pretty interesting, in that "I'm glad this didn't happen" kind of way.
Spoiler
They discover that the Aliens are the anti-life force, and somehow discover a way within the Derelict to make the Aliens implode. LV-426 had been properly terraformed and was a farming colony. Lots of time inside the Derelict. They can't nuke the planet in case all the eggs fly off and infect the universe...
Which was actually something from one of those could-have-been Alien 2s in the official magazine.