So I would take this with a grain of salt or maybe less than that. Batmanonfilm posted a tweet today that hints at Robin Williams as Hugo Strange. While Nolan has already announced two of the villains, and there is nothing stating he must only have two, it seems an odd addition to the already existing cast. Here is the tweet:
So read what you want into it, but I am just telling you what is floating out in the interwebs.
Posted by Dustin