One interesting thing about this video is that at one point, if you look at the wall in the office, you can see a bunch of guns that could have been used in the game, and could be an indication of guns that are in the game.
This is not the first gameplay video that is out though, Treyarch showed off a single player demo during E3.
Good news for everyone, as said in the video, Treyarch will be releasing details about Multi-Player soon
I think this new video is very cool, and shows how impressive Black Ops truly will be when it finally comes out. The most impressive part of the video, at least in my eyes, is the part when the AI uses active duck and roll to cover tactics in an attempt to hide from the player, which could mean that the single player could be a LOT harder with smarter AI.
I just hope Treyarch brings back the Beta so that Black Ops doesn't turn into Modern Warfare 2.
what im hoping is, they metnioned the blowing up of buildings, hopefully its not like the bad company games where you can blow up anythig you possibly want.