Narrative, episodic, standalone series. http://www.bit-tech.net/news/gaming/2014/12/19/minecraft-story-mode-announced-by-telltale/1
Telltale seems to be trying to cash in and make a "episode series" on absolutely anything these days. >_> I played the Borderlands one which was a big yawn, and can't image what a Minecraft (???) one will be like. Perhaps they're aiming this at younger kids (money).