Who were the 6 people who originally trained Batman in the New 52?
In Batman and Robin #4 (of the New 52) Batman makes this remark to his son:
Who are the six people (including Ducard) that trained Batman?
To me this sounds like the setup for a series of comics where these six people are revealed to the reader.
I would hope Zatara is still one of the people who trained The Bat.
The list of people who have trained young Bruce Wayne before he became Batman, IN THE NEW 52, has changed from version to version as DC Comics have revised the character's history, there is a really good story called The Many Deaths of the Batman that shows a killer taking out Batman's trainers but it has been long since dropped from continuity. I only have a partial answer for this question though.
In DC's The New 52, in Batman and Robin #4 we learn that Bruce Wayne was trained by six mentors and that Henri Ducard was the last of these mentors.
In the Batman and Robin title he also says he trained with two mentors whose names were Chu Chin Li and Tsunetomo.
In the New 52 Detective Comics Annual 2012 we see a young Bruce Wayne training with a master named Shihan Matsuda.
Now we know that young Bruce Wayne must have trained with Ra's Al Ghul and met his daughter Talia and at around the same time unknowingly fathered Damian Wayne with Talia, so it's possible that Ra's Al Ghul is himself the fifth mentor but this is as yet to be confirmed at least to my knowledge.
This leaves only one unidentified mentor of the six.