So there's been a fair few de-OGL-ified demons now, and I thought I'd try track them all down/see which ones are missing. Feel free to offer corrections! Some of these are more tenuous than others.
Vrolikai
This replaces the Balor as top demon, representing all sins. Already existed in 1e and 2e, but has been bumped up to CL 20. Same size, no fire whip but it has multiple arms with black flame daggers. Also no need to worry about obscenely broken amounts of object damage to weapons! I like these changes, even if fire whips look cool.
Vansidieth
This replaces the Marilith as the pride demon. Massive change here. This is now a medium, horned, hooved, bestial creature, wielding a flaming sword. Isn't that a Brimorak? No, because this one has wings and a dog face instead of a goat face! Not my favourite visual change, you can probably tell. Too similar to an unrelated demon. It mostly does a lot of debuffing, and is one level higher. It does have a cool ability to increase action economy for its allies. Probably shines in a team rather than solo.
Degholau
This one I'm not as sure of. PathfinderWiki has put it as the replacement for the Glabrezu. In 1e the Glabrezu was listed as the demon of "betrayal, treachery, and treason". In 2e it was tagged as the treachery demon, and the Degholau is the treason demon. They are the same level, but otherwise fairly different. The Degholau is two sizes smaller, and looks like a star-nosed mole from your nightmares. Five morning-star-like tails with an eye on each one. I kinda love it. However it doesn't have Illusory Disguise, which means it can't mechanically replace the Glabrezu in a lot of previous adventures. However that might be fixed by our next new demon...
Miastrilek (and Omox)
This one is I think two demons replacing one. Omox already existed, a medium humanoid-ish ooze that hates cleanliness. More importantly we now have the Miastrilek. It looks like an enormous bloodseeker (it's large), and hates creatures recovering from poison or disease. That's both sides of the sins of the Hezrou! Pollution of body, pollution of the world. The Miastrilek also comes in handy as it can Change Shape, disguising itself as any small or medium humanoid. Hey, that's what we were missing from the Degholau!
Eshmok
The sin of wrath. This is the Vrock replacement. A large flier that's hurt by the Calm spell. It's also a fungally-infested wasp-person. I think the visual design could do with a little more time in the oven, make it more weird/demonic, but overall nice change! And Calistrians hate it. There's no Vrock dance party though, for folks who ever used that.
Kalakaigh
Here's our blood/murder demon. The new Babau! Looks like a horned monkey with a bat face. One of its arms appears to be just bones? The art is in a rougher/more painterly style than the other demons, hard to tell. It can change shape, but in a restricted way that means it always looks like a murderer lurking in an alley XD (black clothes, black gloves, black mask/headcovering). No acid slime reaction, but a bunch more useful/flavourful spells (paralyse/fear/dream message).
Pusk
This is basically just a name change. Sloth demon, used to be Dretch.
Imp
Imps are now the universal fiendish little guy of the Outer Planes, though their appearance will adapt to the plane they spend most time on. So you can keep using that Quasit art for any chthonian imps :)
That means we're only short on replacements for Nalfeshnee (greed) and Nabasu (gluttony) demons, I believe. Potentially also Lilitu, though I'd leave that to lawyers to figure out.
Anyway, opinions? Have I missed the return of greed and gluttony? Do we think they'll pop up in Revenge of the Runelords? Fingers crossed...
