People are mad about how Wonder Women is being crammed into MoS 2. But I think aside from Batman any other character (Flash has also been rumored) are just going to be brief cameos that show them post world engine. Goyer has said multiple times that Superman is the first Superhero to come forward and that he will start the trend (Batman isnt a superhero so he doesnt count). If I had to guess a lot of the Superheros origin is going to be based on what happened with MoS.
Aquaman- Atlantis is effected by World Engine
Flash- Maybe the world engine caused Barry to become the Flash or like Goyer said he follows Superman's lead.
Wonder Woman- World Engine effected Paradise Island, maybe it caused Steve Trevor to crash on it.
So my guess is that Wonder Woman will make a brief appearance, if that's so are you okay with this scenario?