In the smaller parks, where the ops are part of the park 'family' (and probably work closer to 'the boss') the info is normally a lot more forthcoming.
Likewise - these smaller 'families' of staff are proud of their little park, they want it to succeed (because that benefits them too) and so they want to give as much info as they can (and are allowed to) to their guests to entice them to come back.
The bigger parks are always concerned with protecting their next big reveal, or of their competitor stealing the idea (AquaLoop is a good example)... but it can also be because (as we've said before) until we have concrete in the ground, the park can always change their mind - Ala SeaWorld Wild.
That - and at some of the bigger parks - the staff like to screw with your head - ala Scooby fire eyes, and the many Dippin Dots stories we've had over the years.