From Batman News:
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Entertainment Weekly spent a lot of time with director Zack Snyder on set and in the editing room for Batman v Superman: Dawn of Justice, and he revealed that screenwriter Chris Terrio has already completed the script for Justice League.
Speaking of the Justice League, Wonder Woman’s role in Batman v Superman: Dawn of Justice will help set all that up. “She plays a super-important part,” Snyder said. “In a lot of ways, she’s the gateway drug to the rest of the Justice League.”