This falls in line with some of the clues left behind by the good doc on the HHN Orlando page.
And, after some careful digging around on the Orlando building permits site. I found these attraction names listed from Universal.
Bloody Mary House
Looks like this year takes on a new "Lead Host(s)" as clues point to Bloody Mary as well as whoever this "Doc" is that is posting research on her "Immersive" treatments.
Well, mostly. There are usually 8 houses (each with it's own theme) 4-6 scare zones, and several shows.
The entire event has a theme and each haunted house is based on a different aspect of that theme. If you monitor the website for the event HHN 18 you will get clues that lead up to the ultimate name and theme of the event. But, you have to go back often because new clues are left often.
This years theme seems to be reflections of FEAR. Kinda unique and as best I can tell from the clues, revolves around 2 central characters. A doctor and a Investigator with the initials B.S.
You will want to check with the locals about the best day to go. Because, there is a night literally called "Hell" night in which almost every god forsaken teenager in central Florida goes.
Be prepared most of the haunts have 1 - 1½ long waits, if not more. If getting to everything is important to you, then you may want to purchase one of the expensive R.I.P. Tours or the cheaper express pass. The R.I.P. tour gives you behind the scenes info and front of line access to all the haunts and shows. The express pass gives you one-time access to the front of the line.
There are others on here who know more than I do about the event. Most of them seem to be lurking this year. Last year my anticipation lead me to driving my family and friends nuts with wanting to go so bad.
Go on an off peak night, Thursday or Sunday, for it to be a bit quieter.
Best advice for getting the houses done is to get there as they re-open the park gates and just hit house after house. Any house in a studio won't be affected by the sun still being up, but the houses located in the jaws queue, and behind the "Disaster" queue would be better visited when the sun is completeley down.
This will easily fill a full night, so assuming its a 6'o'clock opening, 6 hours should be more than enough if you follow the above advice.
Rocky horror show should be back this year. Great show but not for kids, at all, no matter how mature you or they think they are! I saw so many parents walking out, red faced.
One last tip, hit the very last Bill & Ted show of the evening. Its quieter and tends to be a little more relaxed with some good ab-libbing!
And no way I am bringing the kids...at least not until they are old enough to tell their old man to "go to H*ll", which seems appropriate in this case! =)
Do the events only occur at Studios, or are they at IOA as well?
Walt Disney World's Magic Kingdom
Disney's Animal Kingdom
Disney's Hollywood Studios
Disney California Adventure
Universal's Islands of Adventure
Universal Studios Florida
Universal Studios Hollywood