On this Screen Daily's Product Guide of Cannes market, Castle Falls is listed as completed. There is also mention of Operation Seawolf (listed as in post-prod).
It's not screening at the Cannes market (they don't need to since they sold most major territories), but I also would be happy to see it coming before 2022, either in the fall or winter...
A lot of the more recent films from Dolph and Scott sadly didn't get picked up in my country (apart from the bigger ones like Creed, Aquaman, etc) hopefully this one does !