Doing some research on John Coltrane and I came across this interview with Lewis Porter, and he says toward the end of the interview regarding unreleased Coltrane:
First, there's Alice Coltrane's collection. Now that's the source of the two things you just mentioned. Alice has agreed to issue the rest of her collection, which by the way comes to about another 15 or 20 CD's worth, over the course - and this is the bad news - over the course of the next fifteen or twenty years. She doesn't want to do it very quickly but at least eventually that stuff will come out.
Other than Stellar Regions and Living Space, has some of this stuff come out? Or have I missed some of the cds? Can't seem to find a hint of these on any Coltrane discography that I'm using?
edit: for spelling and grammer