Originally Posted by smallville fan
It's not a Trinity film. The film should be about fleshing out Superman and Batman's characters and having the story centered around them. At most, Diana should be there as just a side character to say "Hey everyone I exist!" and be Bruce Wayne's love interest and then revealed at the end on who she really is. She would take on a similar role to Black Widow in Iron Man 2. Heck in the comics she was a secret agent.
But they aren't going to put in WW and not show off her powers. Just like Widow got to show off, so will she. I don't see why she can't be a scene stealer just because it's "not her movie".