We decided to improve the standard system for character control. No, don't panic. We are not taking anything you are used to away, only adding additional controls that you may choose to use. We believe these controls improve the standard control system by allowing a player to walk, run, step back, trot back, turn left and right, look up and down and jump... all from the mouse only.
No longer must you keep your other hand on the ASDW and space bar for these controls. Just one hand on the mouse and you can move your character around the world in complete control. Of course, you must have a wheel mouse to do so, but hey, that's the current standard.
If you don't have a wheel mouse, don't worry, the standard ASDW and Space bar all still work for you.