i don't think it was written by frank miller. Frank miller's year one comic book is still close to the traditional version.
No, I'm talking about Miller's actual movie script called "Batman: Year One". I know the comic. I have it. It's a favorite of mine. But Frank did indeed write a script that made some crazy departures from the normal Batman origin story. Namely the whole junkyard scenario, the "Big Al" character, and some other stuff, like how he comes up with the idea to base his vigilante persona on a bat.
If I remember correctly, this was the project that got the ball rolling on what eventually ended up as Batman Begins. Miller and Darren Arnofsky were hired to reboot Batman, and the plans were to do it on a smaller scale and budget, almost borderline indie film style. It was that aspect that drew Christian Bale to the idea of a Batman film. Miller and Arnofsky were ditched in favor of Nolan though, and Nolan convinced Bale that it could still be done with a larger budget, a more high profile project, and still be dark/serious/gritty, and the rest is kinda history...
Oddly enough though, by the end of this script, he still ends up the classic Batman we know, in possession of the Wayne fortune and all the trappings that come with it.
I hesitate to link to the script, but it is readily and easily available with a google search of "Frank Miller Batman Year One Movie Script", but here's a link to a review that talks about some of the craziness that occurs in it:
http://www.batman-on-film.com/opinion_jett_yearonereview.html
Anyway, BACK TO THE REDESIGNS!
That is indeed a superb Supergirl.