https://vimeo.com/50148899
Somewhere in this four-part interview video (if I remember correctly), Michael Cuscuna says that a "live in 1964" volume had been prepared and was ready for release. The interview is around five years old, but at that time "1964" was supposed to be the third volume. Plans subsequently changed, of course.
The 1964 recordings have now fallen out of the EU's 50 year copyright protection, but I don't know how much that changes Sony's plans.