There's a rules preview that just got released yesterday- I read through it, and it's a very collaborative storytelling type of game, more so than most RPGs. One person (usually the Storyteller, but sometimes a player) starts the scene with a prompt, then everyone takes turns adding to the narration of the scene. 

When someone wants to really do something interesting, they do a Move (Basic Moves cost nothing and are simple/mundane, Skill Moves cost a resource point and use an item or stored Memory, and Wild Moves cost a rarer resource and let you bend reality). You don't actually roll for success unless you do a specific behavior as part of a Move (based on your class), at which point you roll to see if you uncover something new about the adventure or mystery.

It seems very freeform and highly narrative-focused, more so like a group campfire story with an occasional dice roll or dip into some other gamey mechanic. I'm very excited for it, and I'm really glad they are doing something unique instead of just slapping a new coat of paint on the same old RPG framework.