WoW hunter changed to shooter gameplay.
When Blizzard announced Cataclysm, they also announced that the hunter class in World of Warcraft would undergo significant changes, not using mana any more. At the time that bit of news went unnoticed, due to all the other significant changes to the game.
But now Blizzard revealed more about the changes to hunter gameplay, and the changes are more significant than we originally thought: Instead of using hotkey abilities with mana, hunters in combat will now change into "aiming mode", with a crosshair in the middle of their screen. Using the mouse wheel they can change between first-person and third-person view.
The keyboard selects what kind of shot they want to fire, but the actual firing is done by targeting the enemy with the crosshair and clicking the mouse. The WoW hunter class is being changed to classic shooter gameplay. Apparently lots of people complained that the standard auto-attack plus hotkey combat was too slow, and not really appropriate for the hunter class.
So in future a big part of the damage calculation for hunters will depend on how well you aim your crosshair. This is an attempt to modernize World of Warcraft, shooter gameplay apparently is more popular with the younger crowd.