Just last week it was announced that a brand new documentary was in the works about Justice League: Mortal - the ultimately cancelled DC Comics blockbuster that was going to be directed by George Miller. Now, however, we have an extremely cool sneak peek at this project, as concept art from the film has arrived online.This fascinating bit of artwork comes from the official Twitter account of the aforementioned Justice League: Mortal documentary, and gives us a close look at what the first live-action big screen version of Aquaman would have looked like. I'd argue that this piece has a strangely close appearance to Nicolas Cage - though he wasn't the actor who was going to play the character in George Miller's movie. Instead, that honor was going to go to Venezuelan actor Santiago Cabrera. Regardless, it's a very different direction than the way that Zack Snyder is going with the Jason Momoa version set to be featured in Batman v Superman: Dawn of Justice But that's far from the end of the concept art show. The documentary also has a look at would have been Megan Gale as Wonder Woman /Princess Diana of Themyscira:That image obviously features the superheroine in her home city, but Justice League: Mortal certainly would have brought her to the modern world as well - as seen in the second shot below:Megan Gale obviously never got her chance to play Wonder Woman, but she did get an amazing opportunity to work with George Miller. You can see her in theaters now, actually, as she plays the heroic The Valkyrie in Mad Max: Fury Road The documentary - which is currently operating with the working title Miller’s Justice League Mortal - is currently being assembled, and it's been promised that it will featured interviews with members of the project's cast and crew (in addition to the actors mentioned above, the blockbuster was going to feature Armie Hammer as Batman, D.J. Cotrona as Superman, Adam Brody as The Flash, Hugh Keays-Byrne as Martian Manhunter, Common as Green Lantern, and Teresa Palmer as Talia Al Ghul). Hopefully we'll get to see more sneak peeks in the coming months.