Warner Brothers just released set photos of Diana and Trevor, played by Gal Gadot and Chris Pine respectively. For some that don’t know, Wonder Woman and the rest of the Amazonian warriors live on an island named, Themyscira. We see here the encounter of men. Which is known to not live on the female dominant island.
This will be in the past, since we know that Diana Prince's origin will be explored. The film will also shed light on the present time. So it will be the WW I events, along with the present day issues. Maybe after the events of Batman v Superman: Dawn of Justice.
Source: Daily Mail
Wonder Woman releases June 23rd, 2017