Hello there! I hope this is okay to post. I am more of a lurker and tend not to post much but I made a post on the Paizo's forum replying to a thread about Paizo making a Player Core 3. I was curious what other's may think of my thought and what could be added to the conversation. I do apologize if this has already been mentioned or said. At any rate, this is my reply copy and pasted below with some cleaning up. Thank you all for reading in advance. :)

I think a Player Core 3 will most likely be akin a Advanced Players Guide. Maybe call it Advance Class Guide? I rather it be a seperate product than Player Core 3 since Core comes across as if you need the book to run the game and the classes are easy to play out of the book. But those classes are not generally for beginners and new GMs may want to stay with the more generic themed Core classes. Like Gunslingers and Inventors are uncommon classes with more of a steampunk theme especially since they would need to add guns and gadgets to the book to accommodate those classes so they're a bit more specific than say Rogue. Magus and Summoner have a bit of a learning curve when it comes to their action economy. Psychic and Thamaturge feels like when they really started to experiment more with classes and their playstyles might be harder to grasp for a new player.

But perhaps they can call it Advance Core instead. So it comes across more like an addition than a necessity. There is power behind words and I feel calling it Player Core 3 may lead to wrongful expectations of what the product is. I do support the idea that Paizo consolidates the remaining OGL classes into one book for ease of access and perhaps do some more remaster magic on them outside of just errata so the book can offer a bit more. But also I have to wonder what other content from their respective books makes it into the book and what a realistic page count will be. I can only imagine what a headache that balancing act will be. Perhaps each book will have their respective sections in Advance Core. So guns and gadgets will be lump into the Gunslinger and Inventor section with perhaps more gadgets being added as well as beast guns? The different flavors of magic from Secrets of Magic like True Naming could be lumped into the Magus and Summoner section. Perhaps the Magus would get a new Hybrid Study or perhaps they give an interesting Arcane Cascade feature to Starlit Span while the Summoner gets a new Eidolon type. Maybe something like a Shadow Eidolon to go with the Shadowcaster archetype if it makes it into the book. And with the Psychic and Thamaturge could clean up some stuff with the errata but add some remaster goodness to them since they have time to look under the hood now. Perhaps in their section they could add the cryptic adjustment but also expand more on deviant feats. I don't feel Kinectisit should be added to the book due to it being the first remaster class as well as that class would probably take away a lot of pages that could be focused on Guns and Gears, Secrets of Magic, and Dark Archive content. Plus I feel that class showed the experimental potential they want to have with ORC classes going forward.

So I guess in short, I think the name Advance Class Guide or Advance Core will give better expectations of what the product brings rather than Player Core 3. And if they do make Advance Core, I think they need to add more than just errata to the classes to make it appealing for veterans to pick it up but also give newer players options that are on par with the remaster changes.