Finished missions 8 and 9. Episode 2 (12 missions - 3 more to go) should be done by Monday next week. It may seem like I'm rushing it, but I'm just focusing all my efforts into working on this campaign. It was going pretty slowly before, as I consider Episode 1 and early Episode 2 to be fairly uninteresting story-wise (for me that is, since I know what happens :P), but now that it's starting to get interesting for me it's much easier to work on the missions.
Speaking of the storyline, the description is really just incredibly vague clues as to what it's actually about. But I can't reveal what it's actually about since that would be spoiling things that don't get revealed until some ways into the campaign.
Oh and, I expect to have this campaign completed around late November.