I've read a really good piece where it focuses on Wonder Woman trying to understand Batman better in the New 52 setting. It's titled 'Wonder Woman's Quest to Know Batman'. The author does a great job of showing how Wonder Woman, coming from her own very different world, tries to make sense of Batman's dark and brooding ways. There are some great action scenes where they fight side by side against villains unique to the New 52 storyline.
Well, there's a fanfic called 'Batman and Wonder Woman: New Beginnings in New 52'. In this one, it starts with them having a bit of a misunderstanding which then leads to them realizing they need to work together more closely. It really plays on their different personalities and how they can complement each other in combat and in solving mysteries in the New 52 universe.