Everybody's Gone to the Rapture is an open-world, pure story game. We see it as the natural follow-on to Dear Esther. Rather than a linear environment, the whole games takes place in one large world. We're experimenting with dynamic, adaptive storytelling and audio as the backbone for the game, and re-introducing more interactive elements to the experience. We're currently working in CryEngine3, and at the moment are finalising the world design and gameplay elements, ready to start detailing up the world and creating the large number of audio assets it will require.
The story is still very much in development, but the key concept is this: many games set their action in a post-apocalpytic world. We want to try and create a game that takes place at the moment of apocalypse itself. What happens when time ceases to exist, when the world becomes empty. How do normal people respond to the end of the world itself?