The wait for more of Telltale's excellent episodic series based on The Walking Dead is set to end this week. While the start of the full second season of the choice-based adventure series isn't due until sometime this autumn, The Walking Dead: 400 Days, a standalone episode that will be released as DLC for the first season, is about to start its launch across several consoles, kicking off with the North American PlayStation 3 version as part of tonight's PlayStation Network update.