-Gene Roddenberry, Star Trek-The Motion Picture: A Novel (x)
If you haven’t read it yet, you must read "The Footnote," by Judith Gran which takes this comment and does a line by line analysis.
It’s worth reading the 2000 words, but for the tl:dr her summation:
But although Kirk has refused directly to answer Roddenberry’s question, he has supplied us with some definite statements nonetheless. Let us summarize the information provided in Kirk’s comment, the rest of the note, and the text.
I leave it to each individual reader to decide whether the weight of the evidence tends to support or deny the possibility of a K/S relationship.
I just adore this fandom sometimes.