According to this link, TWD DLC will be released as early as tomorrow. Tomorrow on PSN, Wednesday on PC, then friday on XBL.

http://www.ign.com/articles/2013/07/01/the-walking-dead-400-days-has-a-release-date?utm_campaign=fbposts&utm_source=facebook

I wish I could buy it now, I loved the first story of TWD. I can't wait to play this.

Cool. I really enjoyed TWD.

I clicked the link within your link and had to laugh at:

http://ca.ign.com/articles/2013/06/13/e3-2013-the-walking-dead-400-days-details-season-two-hints

Five stories, many more touch choices.... . Damn my dirty mind. I assume they meant "tough choices".