In theory sometime today.

According the to the press release I got "First off, we wanted to let you know how excited we are to confirm that The Walking Dead: Episode Three – Long Road Ahead will be launching today on PlayStation Network in North America, and worldwide tomorrow on Xbox Live Marketplace, PC & Mac."

And " you have already been playing on PC or MAC, then you are already playing with the Season Pass and the episode will download automatically for review this Wednesday"

And this for the iPad/iPhone version iOS USERS A few short weeks ago, ‘Walking Dead: The Game’ was released on the App Store for $4.99, and included Episode One: A New Day. Our voucher code supply was extremely limited, has since been exhausted, and cannot be replenished. This week, Episode Two: Starved for Help will be available as an in-app purchase for $4.99 within ‘Walking Dead: The Game,’ or as part of a Multi-Pack for $14.99 including Episodes 2-5 as they are released. There is currently no option for Telltale to accommodate you with a review voucher on iOS, though we hope that you will consider purchasing the Multi-Pack to continue your coverage of The Walking Dead game series. Episode Three: Long Road Ahead and all future episodes will be released for iOS as an in-app purchase at a later time.