I know we've seen Cavill with the cape on, and some shots between takes where it's off but... What if, Snyder is thinking of going the Spawn route and using a CGI cape? But only in certain shots. So he can make some of those comic frames literally come to life. I mean, we all know that there are plenty of pics in comics that defy physics. It could work. Again, though, this is just an idea, a little random musing.