Few days ago, a leaked gameplay video of COD: Black Ops had showed a player quickscoping with a sniper, but a recent announcement by community manager Josh Olin has announced via twitter that quickscoping will not be a part of the final version of the game.
Josh said,
No. Quickscoping is a cheap way to play. We’re specifically going to gimp Quickscoping, sorry. Play straight-up!
He later added,
Nope. Quickscoping is way more annoying to a way larger group of people than the quickscoping community who loves to do it. #cheap
If you're one of those wondering what exactly is a "quickscope", it's basically a tactic of quickly aiming down the sight or scope of a weapon and firing almost instantly.