Another possibility is that Charlize Theron might re-team with Patty who helped earn her Best Actress Oscar for Monster. Theron is looking to make a powerful comeback after a batch sluggish films with roles in Jason Reitman's Young Adult, Ridley Scott's Prometheus and George Miller's Max Mad Fury Road. Not to mention starring alongside Thor himself Chris Hemsworth in Snow White And The Huntsman. I think she'd be great for Amora The Enchantress , Brunnhilde The Valkyrie or the villain Hela.
The only problem is that Fury Road is expected to start production in March and there are rumors of a sequel being at the same time. That's of course if she can work it into her busy production for Mad Max. However, with the new release date and a spring production start Marvel would have plenty of time to accommodate Theron's other commitments.