Well Paizo has gone ahead and pulled the plug and there is a new edition of PF in the works that they seem to have mostly completed so playtesting may be to iron out bugs or perhaps eliminate whole systems if it is that rough.
Some people are panicking because they fear PF may simplify things to much. We will have to wait and see the playtest documents before we can 100% guess where things are going.
From the sounds of it they are keeping a lot of what made Pathfinder complex vs 5E- you are getting more options than a 5E PC gets at level 1. 5E for example doesn't use feats (they're optional) and even if used only 1 race gets feats. Pathfinder is not doing this you will get a racial feat at level 1 along with whatever the classes give you.
Pathfinder is not making feats optional and they will be using "micro feats form the sounds of it and we will have to wait and see how they have overhauled feats anyway.
They are using a universal proficiency modifier, whether that is similar to 5E +6 over 20 levels, 4E/Star Wars Saga half level to the number or something else remains to be seen. This I think is mostly to smooth out the numbers, you do not really need +35 to hit AC 45 when + 15 to hit AC 25 is mostly the same thing. This doesn't effect build complexity at although it may once we know more about how things like buff spells scale, stack etc the basic idea is 100% fine IMHO.
They are overhauling the magic items as well. Once again we will need to see what they do here but a long time ago (2007/8) I tested 3.5 (pre PF) and eliminated the entire magic item section and went back to the AD&D system and the game worked fine. A Holy Avenger sword in 3.x is not that exciting when you can sell it and get a better weapon. it is a great weapon when you find it at level 8-10 and trading it is not an option.
They also are using the universal proficiency system for skills- this is something they should have done a long time ago in 3.X and things like skill points sort of debuted in late 2E as character points (that you could spend on other things). Once again this is to simplify numbers and bring skill checks into line with attack rolls so they can interact better.