Forget the Amazon show. There is a War of the Rohirrim animated movie coming out in 2024 from Warner Brothers. It is supposed to be set in the days of Helm Hammerhand, and features Helms Deep and a Mumakil. I wonder if GM would have any rights associated with it? Honestly, they already have enough associated models out to be able to make a few bucks out of it, I would think.

https://variety.com/2022/film/news/lord-of-the-rings-the-war-of-the-rohirrim-release-date-1235181646/

This looks more interesting to me than the Amazon show, to be honest.