The mouse via Steamboat Willie is scheduled to enter public domain? Guess we can look forward to quite eventful three weeks before the end of the year, while Disney is frantically trying to prevent that outcome.
It's my understanding that they still retain a lot of control over Mickey Mouse indefinitely because he is trademarked as the face of their company.
Meanwhile, to keep this at-best modestly interesting historical film locked up for those last few marginal drops of IP, they've kept the entire rest of the culture locked up. Hell of a cost society pays just for that. I'd almost rather we just grant Disney copyright in perpetuity if it would shut them up and leave the rest of the culture alone.