A gameplay helper on stage is commanding the game with his voice, creating a world by demanding mountains and rivers and times of day. McCarthy is using SmartGlass to add to the world, via touch.

It sounds like the game is also headed to PC as McCarthy introduced the trailer we're currently watching as full of gameplay created by players on Xbox One and Windows 8.

Apparently that was just a ruse -- we're talking Xbox Live. First up, SmartGlass.

The "next-generation SmartGlass" is being shown . "You can start a single player game, you can set up multiplayer, purchase in-game add-ons and more."