I admit, the darker colours and sharper lines of her new uniform gives her a darker look. The first thing that came to my mind when I saw the pic was this was how Wonder Woman could look like if she was captured/kidnapped and brainwashed by a villain.
My favourite story idea is an evil warlord kidnapping/capturing Wonder Woman and brainwashing her to be his evil queen/bride.
I believe this was also a recurring theme in the old Superfriends cartoon shows. For example, Superfriends - The Legendary Super Powers Show: "The Bride of Darkseid" and The Super Powers Team - Galactic Guardians: "The Darkseid Deception". In those shows, Darkseid regularly formed plans to make Wonder Woman his queen in addition to conquering Earth.