That seems to be the consensus?
Well, the consensus at least among that part of the hardcore Batman fans* that aren’t hyperventilating at the news. Apparently the guess is that either it’s gonna be the Court of Owls (Gotham-based secret society), Ra’s Al Ghul’s League of Shadows, or possibly both. I’d be able to gather more, except again that everybody’s too busy hyperventilating to explain. Guess we’ll find out!
*I do not say that as a criticism. “Always be yourself — unless you can be Batman. In that case, always be Batman.”