I'm assuming by the title is has something to do with that place he goes where they were training ballerinas. I only saw it once so I can't remember the exact context, but maybe it's like the Black Widows in Marvel or something.
I can't stand Halle Berry, but her running amuck with dogs was one of the best things in the series - of many best things....
I'll trust this could be fun... That Ballet place Wick heads to in 3 had training going on in the back so as said above, pretty sure this is Black Widow the way Black Widow COULD have been....