Okay, it appears that in January 2023 the Thomas Brothers may very well get their Predator (Hunter) copyright back.
The lowdown: The Thomas Brothers legal representation sent Fox/ Disney three (3) Termination notices to reclaim Predator.
1st Notice: Mainly referenced an incorrect copyright number. Hunter script was never registered at the copyright office (which doesn't need to by law) but the Predator rewrite script was, and that's the copyright number that they incorrectly referenced. INVALID PER DISNEY
2nd Notice: Mainly corrected first notice but termination date was now less than two years required by law from notice. INVALID PER DISNEY
3rd Notice: Other than acknowledgement of receipt, nothing in the Disney countersuit is saying it's invalid.
So far, this is just about getting the first two termination notices declared as invalid. Disney is not arguing that the Thomas Brothers don't get the copyright back.
Doc is here:
https://deadline.com/wp-content/uploads/2021/04/FILED_Complaint-with-Exhibits.pdf