Voice commands are exactly what they sound like. They are a feature that enable users to control the functions with their voice. It's supposed to be all futuristic and convenient like Siri was on the iPhone. Xbox will have them, PS4 may not. Voice commands can really come in handy on some consoles. Especially if you are using motion control, which both consoles are supposed to support. The voice command features on the Xbox are going to be about the same as they have been for the Kinect. For the Playstation, voice commands may not be a built-in feature. According to CNet, it may instead be included in the PlayStation Eye camera.