Zack Snyder recently shared a placeholder image of Wonder Woman from Batman vs. Superman. The image features Wonder Woman in the middle of the Crimean War, posing with her comrades while holding the severed heads of their foes. The image brought to mind the creative differences Patty Jenkins faced trying to bring her vision of Wonder Woman to the screen. While the image is inappropriate for Jenkins' version of the character, it would fit right in with a cinematic adaptation of Flashpoint.
In the comics, the Wonder Woman of Flashpoint's dystopian reality was a far cry from most versions of the character. It especially stands in stark contrast to Gal Gadot's portrayal of the character thus far, but holding a few severed heads would be right in Flashpoint Wonder Woman's wheelhouse.
In fact, a beheading is one of her defining acts. When Queen Mera learned her husband, Aquaman, had an affair with Wonder Woman, she attempted to assassinate Diana. Wonder Woman responded by cutting her head off and sending it back to Atlantis.
This set off the war between Themyscira and Atlantis that ravaged the world of Flashpoint. It culminated in a battle between the two armies in the United Kingdom, which was under the Amazons control. Wonder Woman added insult to injury by wearing Mera's helmet into battle.
A handful of heroes, like Cyborg and Thomas Wayne's Batman, tried to stop them from destroying the world, but Wonder Woman's Amazons showed their ruthlessness when Penthesilea murdered Billy Batson in order to keep him from turning into Captain Thunder. The destruction of this war led to The Flash rewriting history again to avert it, creating the New 52 in the process.
It's unclear how faithful Andy Muschietti's Flash film will be to Flashpoint, as he's said it will be a different take on the source material. Given the different tones of previous attempts at scripts, it may not be as grim as the comic was, but it seems like it will have the same premise.
Whatever form The Flash's movie takes, it seems to be using alternate versions of characters. While other characters, like Batman, have past cinematic incarnations to call back to, Wonder Woman doesn't, but she has had more appearances in the DCEU than other Justice League members.
However, using Snyder's vision for the character would do a great job of showing how radically different the DC hero can be in certain circumstances. Contrasting the cinematic Wonder Woman fans know with a ruthless warrior who keeps her opponents heads as souvenirs would get this point across well. Wonder Woman 1984's Diana is a far cry from the Diana seen in Snyder's photo, but a Flashpoint Wonder Woman feels appropriate for this image.