Im Zuge des Showrunnerweggangs hat AMC wenig verwunderlich die Serie auch für eine 4. Staffel verlängert.

AMC has renewed The Walking Dead for a fourth season -- without showrunner Glen Mazzara, who has parted ways with cable's top series.

...

A replacement has yet to be announced, but sources tell The Holywood Reporter that the series might elevate a current member of the show's writing staff.
Quelle: AMC Renews 'The Walking Dead' for Fourth Season; Showrunner Glen Mazzara Departing - Hollywood Reporter