For those of you who are curious if the servers are up, you can check HERE. Just like for black ops 1 and MW3 CallofDuty.com will have status updates. On the site you also have the ability to choose what console you use.
UPDATE : The Servers are at Defcon 4! “All online services are enabled, occasional temporary interruptions can be expected as servers stabilize to accommodate new usage load.”
Also, if you DO happen to get the game early, this will allow you to see when the servers are up and running and ready for you play!
Attention : This does not give a live view of the servers.