One thing that I experienced when I demo'ed some games, was that people are more often than not, interested in the background and fluff.
Models may be cool and game play solid, but without a compelling background to hold all of that together interest can fade real fast. (Granted I demo'ed the game at an anime-con so random folks with brightly colored hair might not be a proper target market lol)
As your club is heavy on 40k, any interested parties would probably be used to over the top personas and the immense scale of things. It would be hard for the DW background to match that as its a totally different kettle of fish, this was a challenge I face as SG didn't release that much fluff material back then. I am hoping that the upcoming Nation Books will address those issues.
Game play wise, I suppose a parallel can be drawn to "steampunk Battlefleet Gothic" if it helps understanding. Some of the comments and questions I took were:
1) Wow the models are so cool, how much do they cost?
2) Where can I buy them?
3) How many factions are there and how do they play?
4) How long does a game last?
5) How balanced is the game? Are there any OP stuff?
5) So whats the story about <faction X>
Best of luck!