So this informed source claims to have read an outline of follow-up to The Dark Knight, which also sets up a fourth Bat-movie. It just needs the Nolan brothers and David S. Goyer to sit down and write a proper script. Since the source in question is spelling-impaired, I’m sure it’s a real Hollywood insider.
The major villain of Batman 3, according to this source? Talia Al-Ghul, taking revenge for her father’s apparent death at the hands of Batman.