Sorry, I read it on the wrong thing. It was on an email I got when I joined the mailing list. Says on facebook opening in 2017. https://www.repeatattenders.com/sign-up
TonyLoser said: "Did anyone get interviewed for this? It says its coming out this year on the website. "
Considering it's UK based, it may be that most of those interviewed are West End repeats, not Broadway repeats....oh, I see that they do intend to come to NYC to film.
I certainly know some NYC repeaters who would be candidates (I'm just a pale imitation, just about double digits on my most frequented show).
Note to the filmmaker or webmaster for the film: The word is sought, even in the UK.