By James Hibberd
Updated July 28, 2011 at 03:07 PM EDT

AMC broke its silence on the recent major showrunner shakeup that’s impacted its highest-rated series, The Walking Dead. No big revelations, but here’s the statement:

The Walking Dead’s Glen Mazzara, writer and executive producer, is expanding his responsibilities to assume the role of showrunner. AMC is grateful to executive producer, writer and pilot director Frank Darabont whose contributions to the success of The Walking Dead are innumerable. We continue to discuss his ongoing role with the series.

Robert Kirkman, creator of The Walking Dead graphic novels, executive producer and writer on the series, will remain in this role and will continue to steward the brand. Gale Anne Hurd will remain in her role as executive producer. The production continues on schedule for an Oct. 16 premiere.

AMC also announced its first digital series, titled The Trivial Pursuits of Arthur Banks. The 40-minute project stars Adam Goldberg and Jeffrey Tambor and will premiere as a co-release on and on Aug. 22. The series is part of a new project by the network, AMC Digital Studios, which aims to create original content for the Web.

The Trivial Pursuits of Arthur Banks is about a theater director (Goldberg) who stages an elaborate play that mirrors his dysfunctional love life. Aided by his therapist (Tambor) and the actors within his meta-life, Arthur attempts to unsort the complex issues that occur each time he falls in love.