Something like the Xeno Fifield would be cool, they could keep it in mind but build on it to get something else and reminiscent. Keep the Zombies for Zombie movies.
A bit of egg morphing could be interesting if something like it goes on in nature on earth. It seems to me that it is better suited for a horror movie because it takes longer for the victim to die compared to being chest busted or being shot.
Correct me if I am mistaken but wasn’t there supposed to be a pyramid in Alien? Maybe they could make something based on that idea? Perhaps they would have to walk through a pyramid before getting to David’s place eventually there could be death traps there but then maybe people would complain that it would be too close to AvP.
Speaking of stupid scenes there was a deleted scene when either Milburn or Fifield discovered a small alien worm that was why they didn’t get scared of the snake. They found the worm and it went fine so they probably thought that they could handle the Hammerpede too, silly but it made a bit more sense to the Hammerpede scene. If there will be some dumb scenes in AC then they should be explained even if it is just by a small line that they say before things go wrong because it makes them look less retarded. I put this in Italic letters because I think that this is very important and something that I hope that they have learned from Prometheus.
Getting lost despite being the map expert, they forgot the map reader. Scenes like this should be explained. In the script its says that they got lost because they forgot the map reader but we didn’t get that in the movie which made them look like idiots. This is another example when they need to explain strange things that happen or else they will make the characters stupid.
Paradise (the green planet) seems to have something in common with the wooden planet that was made as an idea for Alien 3, which I think is cool. Is it just me that see this connection or am I mistaken about this?
Not many would say this so I say it: it would be nice with some bizarre/morbid comedy if it fits the movie as a whole. Just let it be one scene or two. There has got to be some balance in a movie. Comedy hasn’t got to be silly, it can be smart also but it depends on timing and the context.
Having some background on important characters would be nice if it would be necessary for understanding their character. I find Prometheus lacking this kind of thing because it would have helped us to understand why the characters did what they did.
I read a script by Ward and Asano in Alien 3, there was a whole bathroom filled with crap and blood (page 41). This is so disgusting so it could probably be a part of AC. What if the Xeno bursts out of the stomach and there will be crap and blood all around it.
Eventually they had a library in Alien 3 (one of the scripts) that would be nice. I like libraries.
There was something about scarabs in Spaights script. Maybe they could have some good infected bugs that bite people with nasty results?
What if someone survives an alien and that has got to go through some surgery more painful than Shaw’s? That could work and who isn’t getting worried by the thought of surgery?
On Iceland, there are hot Geysers with hot water, maybe this and some lave thing could be used for whatever.
These are some ideas that I have, I hope that the reply fits the purpose of the post.