Before Matt Reeves jumped on board to write and direct The Batman for Warner Bros., Ben Affleck was writing the script and preparing to direct it. At this point, we may never know what exactly he was planning because Reeves is starting from scratch and developing his own idea for the new Batman movie.
We now have an idea of the director and tone that Affleck was looking to take his vision of the film, though, and it's actually pretty cool. According to The Wrap's Umberto Gonzalez, Affleck's The Batman was inspired by a David Fincher film, and that film is 1997's The Game, which starred Michael Douglas and Sean Penn.
I loved The Game and it's not hard to imagine that concept implemented into a Batman movie. The film told the story of a wealthy investment banker who is given an opportunity to participate in a mysterious game. This game turns his life completely upside down when he becomes unable to distinguish between the game and reality.
So it seems like Affleck's The Batman could have been a conspiracy thriller, which could have been fun. It would have been interesting to see Bruce Wayne tangled up in some kind of maddening experience where he can't distinguish between what's real and what's not.
Who knows, though, Reeves says he is planning a "noir driven, detective version of Batman", so there's a good chance that a Batman conspiracy thriller is still something we might see. It obviously won't be the same thing, but whatever it is I can't wait to see it!