Wonder Woman comic writer Greg Rucka has confirmed that the DC character is indeed, queer AF.
In an interview with Comicosity, Rucka confirmed what many fans have long suspected / wrote slashfic about, saying:
"Are we saying Diana has been in love and had relationships with other women? As [illustrator] Nicola [Scott] and I approach it, the answer is obviously yes."
He goes on to clarify that the concept of Wonder Woman's sexuality is "more complicated" than that, though, due to the world the character lives in, where the "concept" of gay simply doesn't exist.
"It’s supposed to be paradise. You’re supposed to be able to live happily. You’re supposed to be able — in a context where one can live happily, and part of what an individual needs for that happiness is to have a partner — to have a fulfilling, romantic and sexual relationship. And the only options are women.
But an Amazon doesn’t look at another Amazon and say, “You’re gay.” They don’t. The concept doesn’t exist."
He then goes on to note that if Wonder Woman were to be straight, it would "[diminish] her character", because "then she leaves paradise only because of a potential romantic relationship with Steve [Trevor]."
"It would hurt the character and take away her heroism," he concludes.
You can read more from Rucka here.