According to Gameranx, Treyarch will be be changing some settings on mode "Kill Confirmed" for Black Ops 2 to help campers not to camp and get in the middle of heat.
Killing an enemy: 50 points
Picking up an enemy tag: 100 points
Picking up a teammate's tag: 25 points
A teammate picks up the tag of a player you killed: 25 points
So now obviously players will be always on foot with non stop action and of course there'll be stilling, arguing who gets the tag.