I personally am happy there's likely gonna be more focus on Serpentfolk. They're one of my favorite villainous races on Golarion. I'm even running a variant of Serpent's Skull in PF2e where I want to inject some Babylonian and Sumerian deities as aliens into the serpentfolk lore overall (there's an old topic somewhere on here about expanding upon Serpent's Skull with ancient aliens that I'm taking a bit from).
I'd love to see some more unique monsters statted out for the Darklands too, since while my group hasn't entered the Darklands yet, they will be fairly soon.