Franchise creator Robert Kirkman and Telltale president Kevin Bruner announced the continuation at San Diego Comic Con this week.
Confirmed at #SDCC! @telltalegames President @kevbru & @RobertKirkman "There WILL be a 3rd season of #TheWalkingDead" pic.twitter.com/d78HM3rm8C
— Telltale Games (@telltalegames) July 26, 2014
That's pretty much all we know at the moment. With the current series yet to finish it's not surprising that Telltale don't want to give too much away. We don't know, for example, if current protagonist and series regular Clementine will make it back for season three - we'll have to wait until the fifth and final episode of the current run to see if she makes it out alive, and if she brings all her limbs along with her.
You can read our review of the penultimate episode, Amid the Ruins, here. Episode 5 is due out sometime in the next few months.