
Isthill |

It's pretty removed from any specific group in Golarion.
Early on the PCs will focus on fighting a few small sects of cultists (and a few weirdly-placed gnolls) before moving on to fighting children and avatars of great old ones, and one very memorable encounter with an actual minor great old one that is very Cthulhu-like. I don't recall Cthulhu himself getting any real lip-service in this one, but there's definitely plenty of brine-based monsters hanging around in the second adventure especially. There's not too many tentacled horrors in this one, at least not as many as you might expect, but it draws from other areas of the mythos to bring both familiar and more obscure mythos creatures to the table (relatively more obscure than Cthulhu, at least), and many of the things players encounter will be creepy in refreshingly different ways.
In summary, yes, there will be lots of Lovecraft-type stuff in this campaign.