Wait a minute, are they actually replacing Demented Dimensions? That actually looked pretty decent, so if they replace that but end up keeping Undead Arena...oof, something is not right with HoS.
As for Insomnia, admittedly it's a bit of a "eh" since they've done Blood Asylum/Reconstruction before. It could be fun, but HoS is honestly stronger when they go for the unique themes that other haunts aren't really doing. (Trapped in the Walls (1st year), Corporate Nightmare, After Hours, Motel Hell etc.)