Vivian Maier also, like Winogrand, left behind a vast amount of unprocessed (and nearly destroyed) film. It is now being developed and scanned after her death.
This also brings to mind another interesting point. Usually photographers themselves decide what their best or most desirable work is, and print and exhibit it accordingly. If your film is processed after your death, then someone else's view of your best latent work is being showcased to the public. Imagine walking through an exhibition of your photographs, but never having seen most of them before! ... Especially years hence, when most of your memories of taking those particular shots have faded from your mind.
That's a very good point. While I seriously doubt my work will ever get known as something important enough to salvage after my death, it is a little disturbing to think that somebody could exercise some sort of artistic skills on work I haven't done anything to other than expose the film. Provenance is another issue that is not clear; how can the work be clearly identified as made by a certain artist, without a signature or some other evidence that it was touched by them?
"Often moments come looking for us". - Robert Frank
"Make good art!" - Neil Gaiman
"...the heart and mind are the true lens of the camera". - Yousuf Karsh