Quoted from benheck:
How are they going to tie the two films together? They take place half a century apart, are thematically very different and share only 2 characters.
Quoted from Perspex:
Slightly disappointed about the combining of the movies, a pin based only on the first movie would've been the ultimate, but I get it might not have had enough 'pin' content to work with. I hope it blends the two well enough.
The impression that I got from listening to the Heighway presentation at Chicago Expo was that there will be two separate rule paths and you start the game by chosing which one you want to follow (Alien or Aliens). Once you complete the first path, it would switch over to the other one. Kinda like picking Autobots or Decepticons in a game of Transformers....