But for DoF, there's a lot of unknowns. For the non-insiders we don't know what the Mouth Brooders look like at all, nor the infected miners. Speaking of which, from the tidbits you've dropped, a lot will be riding on the miners themselves for the scares. (Which granted, might not be what most people are expecting.)
It's a great unknown, but considering how close we are to opening and such little info tossed out so far...it's actually really exciting!