Christopher Nolan's pedigree is impeccable. Insomnia and Memento; so we know he can film driven, obsessive, borderline sociopaths.
The proposed bad guy is Ra Al Ghul who's daughter has an on/off romantic dalliance with the dark knight and who sees The Batman as his natural heir should he fail to achieve his ultimate goal of imortality. My guess would be a shades of grey thriller where we get to see just how much Batman will sacrifice for his vision of justice.
Could be a corker.