So Tom King said on a new podcast that the premise of Batman/Catwoman is that Mask of the Phantasm is continuity, that it happened at the beginning of his Batman career, etc.
I'm not totally thrilled about that, because it makes me think a couple things- 1) him being engaged before really lessons the impact of his relationship with Selina now, after everything he built up for them and their history, and 2) this is obviously going to be some kind of threat/romantic rival for Catwoman to deal with, just like Talia was, which seems shallow.