It was a surprise when Glen Mazzara left the show. Now word from Deadline is that Scott Gimple will replace him. Gimple is expected to convene his writing team to begin work on Season 4 in the next two weeks. He is of course replacing Glen Mazzara, who exited when Walking Dead was renewed for a fourth season last month. Mazzara in turn succeeded The Walking Dead creator/director/original showrunner Frank Darabont several episodes into production on Season 2. Both Darabont and Mazzara were removed from the series.
There have been a lot of rumors about why Mazzara left including a spout with Robert Kirkman. Kirkman has come out and already said that the people saying this have no idea what they are talking about. But rumors will persist.
Below you can check out the new promo for the show that will begin once again on February 10th.