What one of the commenters said:
"The pass is for online play on a pre-owned game you bleeding idiots! You can still play campaign mode on a pre-owned disk, but to play online you will need to pay. So like everyone else is saying, don't be a cheapskate and by the game when it comes out, and you won't have to bother with an online pass.
Just to make it as clear as day: YOU DO NOT NEED TO PAY TO PLAY ONLINE AFTER ALREADY BUYING THE GAME, YOU ONLY HAVE TO BUY AN ONLINE PASS IF YOUR GAME IS PRE-OWNED. Simple enough English?"