Chris Terrio has pretty much replaced David Goyer as screenwriter. Even press releases say something to the effect of "Written by Chris Terrio, from a script by David Goyer". I think the moment Ben Affleck came onboard he had a lot of say and probably requested/recommended Terrio come onboard and rewrite the script. I'm actually a lot less concerned about the script now.
I know a good story is important and all.... but personally I'm just salivating at the thought of seeing Cavill's Superman standing alongside Batman, WW, Aquaman, Flash, and all the rest at the end.
It's hard to imagine an ending to a superhero movie that could be any more epic. And all it will most likely involve is people just standing there! Lol