The Villains Are... [possible spoilers]
According to https://www.youtube.com/watch?v=uD1lRTDzyOg the two villains featured in the film are The Duke of Deception (Danny Huston) and Doctor Poison (Elena Anaya).
In the comics, Doctor Poison is the first costumed criminal Wonder Woman ever fights. She's a Japanese princess and a scientist who aided the Nazis during World War II with chemical weaponry. She's also prominent for being a member of Villainy Inc., which was a team-up of Wonder Woman's primary antagonists in the 40's. She's creepy, demented, and pretty awesome in my opinion.
The Duke of Deception was another early foe for Diana, and was one of Ares's (then called Mars) chief allies. He was a shriveled, little man who manipulated many countries into war in the 40's. He was also notable for being part of the origin of Doctor Psycho, one of Wonder Woman's most prominent enemies. Most recently, he was in the fantastic The Legend of Wonder Woman series in a new take on the character.
Sadly, it doesn't seem like any of the gods actually even appear in the story.