Steve Trevor "“ the spy

There is another interesting shot, which might very well take place in the beginning of the film, prior to the introduction of Diana. And this shot features Steve Trevor, disguised as a German pilot. He steals one of the planes, and wreaks havoc afterwards.

Thus, he is not the character from the comics. And thus, a new arc is described here "“ we find out how he ended on Themyscira in the first place. Most likely, he is shot down. And, most likely, we will see some very awesome dogfights over the island.

Which will lead Hippolyta to say that the humans don't deserve Diana.

This is just speculation at this point. However, the trailer does suggest this. And there is also another scene, resembling the one in the bar in Inglorious Basterds, in which Wonder Woman easily (and, actually, as if she were bored) dispatches her enemies.

If I were to bet on something, I'd bet that Trevor is a spy.