The fist Spec Ops details for Modern Warfare 3 has just arrived.
USA Today has wrote a report on the new "Survival" mode and Spec Ops. We will summarize it below.

First of, lets talk about Spec Ops. A new addition to Spec Ops is that is has its own ranking system, online matchmaking system and leaderboards. 
"All that stuff really fleshes out Spec Ops and adds in a lot that we know our fans are going to love, some of the most addictive aspects of Multiplayer," says Infinity Ward creative strategist Robert Bowling.

USA Today played with executive producer Mark Rubin in the new Survival Mode. This is kind of like Zombies in Black Ops. He played on a map called, Dome. Dome is a "derelict Cod War-ere desert radar command bunker". In game currency will be included in survival mode and you can buy stuff like turret guns. Dogs will return in survival mode. After a while, the dogs will become suicide bomber dogs. Juggernauts also returns to Spec Ops.

So there you have it. You do not have to read the entire article, just read here.

Also, keep on checking this website for new information. More information about Modern Warfare 3 is coming soon. We expect that there will be an announcement about Multiplayer. Many sources think it will be about, Call of Duty: Elite.