Right, I've written out a full plan now (complete with retro-spective stuff), so I think I'm all planned out. A Training mission is planned, as is a release of Episode 1 when it's done (with the Training mission) as it's own thing before the whole release, to keep people interested. What with my ZDoom Wars contribution being one monster and a strategy guide short of completion, that's not all that far away (could easily be done before the year is out).
Obviously I'll keep the large part of my plans secret until they're either done or released, but I'll try and keep people updated, perhaps with screenshots if maps or whatever are being done.