First, I believe that there must be some heirs of Earl Derr Biggers living today, but I am not certain as to that. Next, there will be "extra" material in the upcoming Chan release that is, it seems, due for release in early December. As for what will or ill not be included with furure releases, I do not know at this time.
Also, Gene, as you know, the next Charlie Chan showing at the Old Town Music Hall is set for this coming weekend. I plan to be there, hopefully for the matanee. I have a class that ends around noon, and I (with Gary) will be hurrying up to El Segundo in hopea of an on-time arrival.