Ok, figured I would add this- Mediablasters is currently in talks to pick up more Toku from Toei. They did post a picture on their social media of the poster for Black Sun, but the YouTube channel made clear that he was just taking pics on the tour of their offices & it does not necessarily mean that he is either trying to do Black Sun or has the rights.
EDIT: Aaand, it appears Trump put a tariff on foreign films now, so this might be a semi permanent road block