IPs that have been used at the event before (spoiler tagging for length):
People Under the Stairs
Psycho
Crypt Keeper
The Mummy
Classic Monsters
Marvel
Jurassic Park
All Nite Die-in 2 IPs (Scream, Hellraiser, Silence of the Lambs, The Ring)
Friday the 13th
Nightmare on Elm Street
TCM
Dead Silence
The Thing
Doomsday
Saw
Child's Play
Wolfman
Dracula
Frankenstein
Cirque du Freak
Silver Screams IPs (Phantom of the Opera, My Bloody Valentine, Evil Dead, The Thing, Shaun of the Dead, The Strangers)
Alice Cooper
Penn and Teller
Silent Hill
TWD
Cabin in the Woods
AWIL
Resident Evil
Halloween
AVP
From Dusk Till Dawn
FVJ
Insidious
The Purge
That's a total of 41 IPs! What we can eliminate:
TCM and TWD (we know about them)
The Purge and Evil Dead (not happening)
Any of last year's other IPs (AWIL, Insidious, FVJ, and probably NOES and F13th as well)
Psycho (no Hitchcock)
All of the Silver Screams IPs (The IP in Parade has never been there before)
Classic Monsters (They've been in there before)
Scream (Because of last year)
Saw (No repeats)
AVP (Needs a soundstage and probably would count as a repeat)
JP (Needs a soundstage)
Marvel (Contract might restrict it)
IPs that probably wouldn't be used again (People Under the Stairs, Doomsday, FDTD, CITW, Alice Cooper, Cirque du Freak, Dead Silence)
Eliminating those leaves us with Crypt Keeper, Hellraiser, Silence of the Lambs, The Ring, Child's Play, Penn and Teller, Silent Hill, Resident Evil, and Halloween.