UPDATE: Turns out this isn't his ditched "Batman", best guess is the "Noah's Ark" project he was pursuing in 2008 which was ready to go but didn't receive studio support for. Otherwise it's likely something new entirely which we haven't heard about yet.
ORIGINAL: Years before "Batman Begins" were even considered, filmmaker Darren Aronofsky pitched an R-rated, hardcore gritty take on Batman to Warner Bros. Pictures. His version was to have Batman as "a real guy running around fighting crime. No super-powers, no villains, just corruption."
Of course the studio pursued a different take with filmmaker Chris Nolan which they preferred. Yet now that Nolan's about to begin work on the final chapter in his trilogy, many have begun to wonder whether Aronofsky might be coming back around to the franchise - especially as he's now onboard the "X-Men" spin-off "The Wolverine".
Whether it happens or not, a recent interview the filmmaker gave to Clothes on Film (via AICN) indicated that we may actually see his take on Batman in a graphic novel - "It hasn't really been announced, I don't know if I should give you the scoop! But we're getting there. We're doing a comic book of a script that's really hard to make and we're going to do a comic version first and see what happens."
He then goes on to point out how fringe comics like "Kick-Ass" and "Scott Pilgrim" have become films, and Hollywood presently isn't as impressed with original scripts as they are with full on graphic novels which give them a better idea of the final outcome.