If there is one thing that comic book fans love above all else it's continuity. There have been entire story lines that were written just to alter continuity. So when Wonder Woman appeared in Batman v Superman: Dawn of Justice she declared "100 years ago, I walked away from mankind." People assumed that the horrors Diana witnessed during World War I were enough to convince her to walk away. So far so good.
However, by the time we got the Wonder Woman solo movie, something had changed. The Diana at the end of the movie didn't seem to hate humanity at all. Actually, it was her love of humanity that kept her from becoming a weapon of Ares. There is a sequel announced and rumors are that it'll take place during the Cold War. So now there's a wrinkle that needs to be solved and during a press event in Beijing actress Gal Gadot was very frank that they decided to make a change to the character.
None of us knew exactly, exactly, what's the backstory of Wonder Woman. And once they decided to shoot the solo movie, [the] Wonder Woman movie, and we started to dig in and understand the core of the character, we realized that actually there is no way that Wonder Woman will EVER give up on mankind. The reason why she left the island was because she wanted to make their life better and safer. They are her colleagues, so I'm giving you a very honest answer, that it was sometimes, you know, creative processes establish something that is not necessarily the right decision. But then you can always correct it and change it. So Wonder Woman will always be there as far as she [has] concerns for mankind.
So there it is; the first official recon of the DC Extended Universe. This is a big deal because it means a lot of things are on the table to be retconned from previous movies. Maybe they can find some way to retcon all of the Batman and Superman murders.
Summary: Fueled by his restored faith in humanity and inspired by Superman's selfless act, Bruce Wayne enlists the help of his newfound ally, Diana Prince, to face an even greater enemy.
Justice League, directed by Zack Snyder, stars Ben Affleck, Gal Gadot, Jason Momoa, Ezra Miller, Ray Fisher, and Henry Cavill. It will be released on November 17th.