Well, looking back at previous Battlefield games, no additional singleplayer content was added. It's safe to say that no additional single player campaigns will be added with future DLC, especially considering we didn't get campaigns in the previous two DLCs. It's too bad, I'd have liked seeing new campaigns too, but realistically, Battlefield has always been a multiplayer series. Many people would be mad at DICE if they included a single player campaign in a DLC if the multiplayer component of the DLC was flawed, or even just lacking.
