Not much is known about the plot of "Justice League" but with Lex Luthor making an appearance, we are going to get our first look at a major DC comic location - Arkham Asylum. The special edition of Batman v Superman: Dawn of Justice revealed that is where Lex Luthor resides.
"Justice League", according to Cinema Blend, also as "Arkham Guard" and "Lex Luthor's Guard" in its list of extras so the location will indeed make an apperance in the film. The Arkham Asylum has been before but only for a few seconds, like in Batman Forever where The Riddler wound up there after getting defeated by the Caped Crusader.
Arkham Asylum has been an important location in the DC comics and video games but it is unlikely it will be a major location in "Justice League." It has been rumored that it would be a major location for a future Batman standalone movie but that movie was supposed to have several villains in it.
"Justice League", according to Digital Spy, sees Batman and Wonder Woman recruiting a group of beings with supernatural powers to face a more powerful enemy. They end up recruiting a stellar cast of superheroes including Aquaman, The Flash and Cyborg. Despite getting killed off at Batman vs Superman: Dawn of Justice, Superman is expected to come back from the dead one way or the other in order to help the other superheroes.
"Justice League" stars Jesse Eisenberg as Lex Luthor, Ben Affleck as Batman, Henry Cavill as Superman, Gal Gadot as Wonder Woman, Barry Allen as The Flash, Amy Adams as Lois Lane, Amber Heard as Mera, Jason Momoa as Aquaman, J.K. Simmons as Commissioner Gordon and Diane Lane as Martha Kent. The movie is directed and co-written by Zack Snyder, the same person behind Batman v Superman: Dawn of Justice.
Check out the trailer for "Justice League", a movie that's scheduled to hit theaters on Nov. 17: