In the preview, Vincent D’Onofrio’s Wilson Fisk, a.k.a. Kingpin, asks Charlie Cox’s Matt why he stopped being a vigilante, to which Matt responds, “A line was crossed.” While Matt doesn’t provide any further context,

A sit-down between Daredevil (Charlie Cox) and now mayor 'Kingpin' Fisk, played by Vincent D'Onofrio, is a backdrop for an inevitable violent clash of characters that underpinned the original Netflix action series.

Vincent D’Onofrio says that the 'Mayor Fisk' storyline in Daredevil: Born Again won't end the same way that it does in Marvel Comics.