Casting Wonder Woman may sound like a tall order, but if you ask the online fan communities, Bridget Regan may be the name you hear more than any other. While that tends to be a sign of enthusiasts getting ahead of themselves, in this case the argument is a compelling one.
Regan's work on Legend of the Seeker (2008) is the main evidence of her ability to do Diana justice: a medieval-fantasy adventure series casting Regan as the last of her order, in a quest to vanquish evil through swords and sorcery (with a dash of romance for flavor). It's not easy to hold one's own in battle and dialogue, but over the course of the series' two series, Regan created one well-rounded warrior woman.
A relative unknown with two years experience playing a similar role could be the direction the studio wishes to take. If Regan wins the role, skeptics should rest easy: Diana is in good hands with this fan-favorite.