Re: Batman Begins Part III
I dunno, I think I'd prefer Talia al Ghul to Catwoman honestly in the context of Nolan's world.
My vote is Katrina Kaif as Talia al Ghul:


She's a Bollywood actress, but her first language is English having been raised in Hawaii. How perfect is that second shot anyway? Wowza.
Also from Wikipedia:
In the years since Talia meets Batman, she is repeatedly torn between loyalty to her father and her love of Batman. However, she has proven an important 'ally' in her way; most prominently, she encourages Batman to return to Gotham City when it is declared a "No Man's Land" following an earthquake, and he has lost his fighting spirit and didn't believe he could save Gotham.
Sounds like the character can come and counsel Batman if things get even worse in the third film.
Harley Quinn would also be great in the Nolan universe but how they do that now with the Joker situation up in the air is anyone's guess. Female Robin would be ... interesting, but it also might create the wrong type of sexual tension.