Therin of Andor said:
Leonard Maizlish died years ago.
Ernie Over and Majel sorted through all of Gene's papers - that's how they found the paperwork that was developed into the TV series "Andromeda" and "Earth: Final Conflict" and the comic series, "Lost Universe".
Gene "Rod" Roddenberry Jr has mentioned in interviews that the Estate has copies of all the "Phase II" scripts, and the attempts to make the first feature film, but as Paramount paid for them to be developed in the first place, it's not up to the Roddenberry Estate to publish or sell them. That would include the JFK treatment.
"The God Thing" was different. Gene (and others, including Walter Koenig and Susan Sacket, IIRC) had already tried to work with it, and then Majel turned down Michael Jan Friedman's attempt to expand it. Pocket wasn't interested in Roddenberry's biographer, David Alexander, having a go at it. So it stays in limbo. And probably isn't all that innovative today.