So, in other words, ditching most of the New52 Black Canary origin / background story?
Somewhere she had a connection with Slade Wilson, and then there was her apparent rock star phase. Black Canary had some major changes post-Flashpoint and they may not be as easy to integrate with her previous backstory.
(And of course it doesn't seem like DC is big on spelling out what is still "canon" or not . . . )