According to news we have found on Reddit a look at the co-op campaign in Call of Duty: Black Ops is on its way to us very soon.
The official website for Black Ops 2 says “Watch the Campaign Co-op Playthrough”
The description reads: “Catch your first glimpse of the all-new co-op campaign with the Ramses Station playthrough”
The Ramses Station is the mission shown to press earlier this year and also what you got to see in the release trailer.
It’s a safe guess that we will be seeing this footage next week at E3