Some recent activity online, as well as a rumor from a DC fan page, suggest that American Horror Story star Finn Wittrock is the actor who has been tapped to play Dick Grayson in the Nightwing movie.
Finn Wittrock recently followed director Chris McKay on Twitter, but the two have had absolutely no exchanges whatsoever.
It should be noted, I am not Warner Bros, Chris McKay, DC Films, etc. I felt confident enough to confirm Finn as Nightwing as an EXCLUSIVE.
Then, the owner of the DC Extended Universe fan page on Facebook posted an update to their page claiming that an anonymous source tipped them off that Finn Wittrock had indeed landed the role of Nightwing.