Mojang indicates that Story Mode won't feature an official backstory for Minecraft “Steve,” further emphasizing that Story Mode won't seek to explain the existence of the Minecraft world in detail.
Story Mode, like other Telltale titles, will be released in episodic fashion over a period of “seasons.” The first episode is slated for a 2015 launch on Xbox One, Xbox 360, PS3, PS4, PC, Mac, iOS, and Android.
Read more here: https://mojang.com/announcing-minecraft-story-mode/
Telltale's post can be found here: http://www.telltalegames.com/blog/88513/telltale-and-mojang-developing-minecraft-story-mode-a-telltale-games-series-for-2015
- Steve "Lelldorianx" Burke.