Who is the Black Mask? The answer has finally been revealed in Batman #697. As I correctly mused, the new Black Mask turned out to be Dr. Jeremiah Arkham, who ran the Arkham Asylum. It turns out he had a split personality; helping people yet being a manipulative crime boss at the same time. Arkham was being manipulated by a female named Fright.
Dick Grayson defeated Black Mask, Dr. Death, and the Reaper as well. The main subplot with Catwoman revealed that she is teaming up with Katrina Falcone, who is now her sidekick called CATGIRL. This major Tony Daniel storyarc finished very strong.
With Bruce Wayne’s return being imminent, it looks like Batman 700 will be another fresh start for Batman. Dick Grayson filled in admirably.