As the article says, anonymous developers for the game have stated that players will be able to individually select gender, voice, and witch/wizard classification. While this is becoming more commonplace in current games with customization, I find it particularly apt in this case, given how J.K. Rowling has come under fire for transphobic statements...and books. Including the ability to have transgender characters seems to show that this game truly is not under any sort of creative direction of J.K. Rowling's, which is quite interesting.
ETA: Link is for the article, but seems to have some protection against the preview that is normal for posted article links. However, the article is by Jason Schreier, which I feel lends a certain credibility to the report.