I think there will be two models at launch, a PS5 and PS5 Pro. GPU will likely follow similar config of PS4 to PS4 Pro.
But there also will be a PS5 Pro+ or PS5K sometime in 2023 with doubled config of PS5Pro at 5nm(?). Perhaps 5K resolutions or 4K 60fps.
e=mc^2
Gaming on: PS4 Pro, Switch, SNES Mini, Wii U, PC (i5-7400, GTX 1060)