It also lists several story outlines that were assigned at that point, but not produced (this is the last writers report in the Roddenberry papers at UCLA):
"Van Voyt's Robots" (D.C. Fontana)
"Ears" (D.C. Fontana)
"Japan Triumphant" (Lee Cronin)
"One Million, B.C." (Lee Cronin)
"Shore Leave II" (Theodore Sturgeon)
One Million B.C. - THAT sparks my interest in what it might have been about.