From what I've heard (and seen *cackles*), the houses are strong. The three original originals all sound like classic HHN stunners. The type of houses that they typically only have one of each year.
The performances are always the unknown. Weak concepts can be elevated by a passionate cast (Havoc 2010). "Obvious" home runs can struggle because of turnover, drama, or just never clicking scare-wise (Roanoke). And there's so little actual rehearsal, no one will know until the second week which has a shot to reach its potential.
EDIT - And Hook... if I'm right that'll be something special.