I'll just say what I said last time: So many of my favorite girlz is killers and two of my favorite boyz has a problem with that. Is she is or is she ain't? Watch and see that Selina didn't kill Black Mask, and Bruce will smugly tell her that he suspected all along, so that's why he gave her the benefit of the doubt...
Joker's sitting in a dark corner somewhere, muttering "not dead yet" over and over and over...