There isn't any real stealth in CoD, just follow the leader or GO TO THIS SPOT NOW stealth. But I'm sure they'll include some kind of mission like they have the previous few games. Maybe the Cliffhanger mission in MW2 is a good example of what they could do, but other than that I don't think CoD has any real stealth.
Edit: Damned double post.
Edit: Damned double post.