The possibilities appear exciting. A player sees a video game on the PlayStation Store, and they immediately try out a demo without waiting. They can then start playing the game, sharing clips with friends through a single button press. Other players might watch a live broadcast of your game, and even add tips to help you conquer a difficult challenge. This is a world Sony describes after revealing the PlayStation 4 at an event in New York on Wednesday. There's one huge question: What exactly will the hardware hosting this gaming utopia look like?