I think Stern was wise to pass on this to be honest. I have a soft spot for these movies, watched them as a kid (I was born in '77) and Christopher Reeve is still the definitive Superman for me. But ... I don't think they've aged that well for modern audiences. It's a funny match with with what DC is doing now, the scenes are going to look dated a bit corny on an LCD, and don't scream "pinball moments" to me.
Beetlejuice would be a much better game to hang rule sets and theme on if I was picking 'rejected Franchi games'.
Ah well, thanks for sharing, still fun.