Btw just pure speculation, how much do you guys think are left?
I personally think Multiplayer is more and less done and has been for a while, I think right now they're just adding some extra maps and balancing while waiting for the SP to finish. As for the SP I think it's playable but somewhat in an alpha state, still finishing scenes, balancing, minor new features, quests and so forth
I personally hope after the release they go all in on a co-op campaign DLC, I don't care if I have to play everything in real-time actually it will only force players to work more together and since it's a DLC if people don't like it, then you know just don't buy it