I guess the crown prince of crime is going to be a wise guy. This attempt to recast the Joker as an organised crime figure does resonate with me since a lot of the animated Batman stories had this as the back story of the Joker, and you can see Warner Bros logic behind it. Our attempts to make Batman into a franchise have all fallen short of expectation and the best-considered version, Christopher Nolans 2008 Dark Knight had a genuinely compelling villain. Which Film Directors have made the most admired Movies about career crooks? Martin Scorsese has so we'll hire him to oversee our production about a psychotic Comic Book Villain in the hope this will make the audience feel our Joker is more realistic or credible. Whether Mr Scorsese gets a say in casting, editing or anything else, I doubt, but it does smack of desperation on Warner's part.
