Great questions, Janus.
The answers:
1) Crucible was never really likely to make it to the board game phase...it was mainly an experiment in balanced wargaming as a gift to the online community for all the support they've give the company.
2) The Great War is complete, indeed. The big hurdles are twofold:
---The money (the lesser of the two) required to get a very complex game to market...molds, printing, boxes, etc. All of the art is ready, all of the models are ready.
---The storage space! This is the big one. Storing big box games turned out to be much more difficult and costly than we had imagined. They can only be stacked a few boxes high because of crushing, so the number of palettes required is much larger than you might think. Each of these runs a monthly storage charge which greatly increases the overhead of our little company beyond where we'd like to be.
3) Third Reich is actually pretty far along, though releasing it in a box would require all the same hurdles as The Great War. We won't even go there

until the Great War is released.
4) Future directions...we're "toying" with a collectible card game idea now, which unfortunately may not appeal to the most loyal of Imp Games fans (I've always liked big board games and big card games, myself, though I know this isn't the rule). This would be MUCH more publishable, and obviously easier to warehouse. I have a rule system and some early artwork, and it's lookin' good. The only problem would be to find the time to get it going...I'm back in school and have three kids, so this is non-trivial challenge, as those with kids know well.
I hope this provides some answers for you, Janus.
Imp