Marvel would be dumb to burn a bridge with someone they might want to work on with another project. Just a PC way of saying they did not agree and they went another way sort of thing.
...I mean, sure, that excuse just about covers everything...but it doesn't really tell us why. The husband could be a cross-dressing tranny, or the wife could be shagging the entire LA Lakers roster...we really don't know other than "irreconcilable differences".
I am curious why Patty Jenkins would just drop the project which she was very much excited to do, and she has expressed her desires to direct a superhero flick. Something doesn't seem right.