I’d like to preface this one by saying take this with a grain of salt as it is only 3rd hand information. Richard Daborn pointed me towards this post:
“I’m not sure if any of this is known, but my Brother works in TV and one of the crews he works with came back from Morocco about 10 days ago (I waited until I knew it would be okay to mention). He was told that the area of desert they were shooting (where Scott shot Kingdom of Heaven) on had just been recced by Scott and he’s given the go ahead for them to start work on a pyramid!
The person who told my Brother thought it was going to be a part of Earth, but the pyramid sounds suspiciously like the original pyramid idea for Alien, so might actually be Acheron, or another planet.”
This was posted over at the Aliens Legacy forum.