Would they ever use the said nitrgoen for a fog screen? I really do not know how they work or much about them so please don't attack me with that one! I'm just saying that b/c of the "rumor" that popped up here once...
And to those wondering about any kids or their own on FJ, don't forget to show them the queue, with all the discussion lately I'm not sure if Uni said this early on (i think), recently, or at all, but can't one just experience the queue and then bail out for the kuka palooza?
Also, SPOILER
Since the nitrogen is being pumped into that area of the show building, maybe we can assume that the whole dementor encounter is on the greenhouse side of the attraction (or at least starts there; assuming they're not pumping it to any portion of the building which is obv. easily possible). And based on those inside pics, looks like we'll be going through one of those carousels just before we encounter them. And according to screamscape, this would be at the end of FJ. Just throwing that out there as discussion of the plot/order of events on FJ.
And for all the talk of how scary it will be, don't forget that it is rumored to be an entire army of dementors!