The Walking Dead's third season hasn't finished airing, but the bulk of filming was completed last year and the focus is now on development of the fourth season. With Scott M. Gimple taking over as showrunner of series, it's being reported that a few new writers are joining the team.

According to THR, Curtis Gwinn (Death Valley), Channing Powell (White Collar), and Matt Negrete (White Collar) will be working in the writers' room along with Scott M. Gimple, Robert Kirkman, and a number of other writers who contributed to the past seasons.

As for what we can expect from the upcoming season, we'll have more details after the season 3 finale airs. Until then, here are some quotes from a recent Comic Book Resources interview at PaleyFest:

Robert Kirkman: “We’ve always been sort of moving in and out of the comic book, and I think that we’re going to continue to do that. I think that there are huge elements of the comic book in Season 3. Moving into Season 4, it’s going to be pretty much the same…”

Gale Anne Hurd: “We are going to amp up the threat of the walkers, because they’ve started to seem like a manageable threat. They are not a manageable threat… [Scott M. Gimple is] very character-driven; he wrote the episode where Sofia comes out of the barn, he wrote [the Season 3 episode] ‘Clear,’ so you get his voice.”

If you missed the recent news, here's the official AMC announcement regarding The Walking Dead Season 4 development:

"AMC announced today that the cast and crew of “The Walking Dead” return to Atlanta, Georgia on Monday, May 6th to begin production on season four. AMC also confirms Scott M. Gimple as showrunner and executive producer for the series’ fourth season to premiere in October with 16 episodes. Gimple has been on the show’s writing staff since season two. Co-Executive Producer, Emmy® Award-winning Special Effects Makeup Supervisor and Director Greg Nicotero and Producer Tom Luse have also been elevated to executive producers. “The Walking Dead” is based on the comic book series created and written by Robert Kirkman and published by Skybound, Kirkman’s imprint at Image Comics. Kirkman, Gale Anne Hurd and David Alpert continue to serve as executive producers for season four.

“Scott has been an essential part of this show since he came aboard at the very beginning of season two. He’s contributed to guiding this show in a substantial way that has resulted in a lot of the key scenes and storylines fans have dubbed signature moments of ‘The Walking Dead,’ ” said Kirkman. “I am thrilled to begin work on a brand new season of ‘The Walking Dead’ with Scott at the helm, and I truly believe we could be embarking on what will be the best season of this show yet.”

“Scott’s voice has been an integral one since he joined the show. Greg Nicotero is a true artist whose work is simply brilliant. And, Tom Luse has really created the machine that allows this very large show to get made week to week. We congratulate all three in their new roles on the series and look forward to ramping up production on season four,” said Joel Stillerman, AMC’s EVP of original programming, production and digital content.

“I’m thrilled to continue the tradition of the spectacular, cinematic, horrifying, exciting and emotional storytelling of ‘The Walking Dead,’” said Gimple. “I’m a huge fan of the comics, and started with the show on the other side of the set, as an avid viewer. Over the past two years, it’s been an incredible privilege making such great television with the best cast and crew I’ve ever worked with – I can’t wait to make some more.”

Gimple has written some of the most celebrated and talked-about episodes from seasons two and three including episode 306 (Hounded) and last season’s climatic mid-season finale episode 207 (Pretty Much Dead Already), which revealed Sophia in the barn. Gimple previously worked on NBC’s acclaimed series “Life” and ABC’s cult favorite “Flashforward.” “Flashfoward” began as a collaboration with David S. Goyer (The Dark Knight, Man of Steel) with whom he co-wrote both the Sony feature film Ghost Rider: Spirit of Vengeance and episodes two and three in the upcoming inaugural season of Starz’ “DaVinci’s Demons.” Gimple also worked for Matt Groening’s Bongo Comics, where he wrote and edited “Simpsons Comics.” He has also written stories for the comic books “What If?” and “Spider-Man Unlimited.”

Nicotero (Kill Bill, Transformers, Inglorious Basterds) and his team received the Emmy® Award for Outstanding Prosthetic Makeup two years in a row (2011/2012) for their work on “The Walking Dead.” In addition to leading the visual and special effects and makeup for the series, Nicotero has directed several episodes. Luse (Remember the Titans, “One Tree Hill,” Jeepers Creepers, “The Joneses,” “Everwood”) has been with the show since the beginning of production and was instrumental in setting up the production of AMC’s first owned scripted series. Based in Atlanta, he manages and oversees the day-to-day production of the series."