Rise of The Clown Prince?

Translated from a german website interview with Chris Nolan on the IMAX preview.

“The whole thing is not ‘Joker Begins’, because we did not tell how the
Joker became what he is”, says director Christopher Nolan. “During these five
minutes it is shown how the joker of the small crook becomes the most-dreaded
gangster of the city – it is more of a “The Rise of the Joker”