The new Justice League Gods and Monsters is out on the torrents. Its fucking FANTASTIC. Bruce Timm should never have been allowed to leave as head of DC's animation team. I can't recommend it highly enough to those who like the old style of DC animated or just superhero movies.
Short version - everything's a slightly alternate reality. Superman was raised by Mexican migrants instead of the Kent's. Kirk Langstrom is Batman instead of Man-Bat. Wonder Woman is from another universe. Amanda Waller is president. Lex Luthor is some kind of Robert Oppenheimer style genius. Its really fascinating.