Other than the comics the stories its derived from, Zack has said the main inspiration for Justice Legaue are the films Seven Samurai and The Lord of the Rings
The Seven Samurai stuff is preeety much the main narrative, but I'm pretty sure the LOTR stuff refers to the opening being this massive battle sequence.
Now im just wondering whether the inspiration is going to be like a kind of Pelenor fields type sequence - which is indicated by the trailer somewhat, or more of a helms deep siege scenario
Im getting hyped just typing it out