Prior to Wonder Woman, director Patty Jenkins was going to direct Thor: The Dark World for Marvel Studios.
However, things went sour as Jenkins departed Thor 2 citing "creative differences."
Now while promoting Wonder Woman, Patty Jenkins fills in Buzz Feed what her Thor 2 would have been, describing it as Romeo and Juliet:
"I pitched them that I wanted to do Romeo and Juliet. I wanted Jane to be stuck on Earth and Thor to be stuck where he is. And Thor to be forbidden to come and save Jane because Earth doesn't matter. And then by coming to save her ... they end up discovering that Malekith is hiding the dark energy inside of Earth because he knows that Odin doesn't care about Earth, and so he's using Odin's disinterest in Earth to trick him.
"And so it was like, I wanted it to be a grand [movie] based on Romeo and Juliet ... a war between the gods and the earthlings, and Thor saves the day and ends up saving Earth."
As noted, Patty Jenkins also filled in Uproxx the following details about Thor 2:
"I don’t think I could have made a good movie out of Thor 2 because I wasn’t the right director. And I don’t think I would have been in the running for Wonder Woman as a result. And that’s one of the reasons why I’m glad I didn’t do it because I could have made a great Thor if I could have done the story that I was wanting to do. But I don’t think I was the right person to make a great Thor out of the story they wanted to do."
It's probably a good thing she stuck with Wonder Woman, eh?