The release dates are all over the place though they do all come out this month. In fact the first release came out today! (How strange is it to see something coming out on PSN before XBLA?)

The Walking Dead: 400 Days is here this week – and we have release dates!

Tuesday, July 2nd — PlayStation Network(SCEA, North America)
Wednesday, July 3rd — PC/Mac (Steam, Telltale Games Store, Worldwide)
Friday, July 5th — Xbox Live (Worldwide)
Wednesday, July 10th — PlayStation Network (SCEE, Europe)
Thursday, July 11th — iOS App Store (Worldwide)

400-days