PlayStation 5 has a new unit called the Geometry Engine which brings handling of triangles and other primitives under
full programmatic control.
As a game developer you're free to ignore its existence and use the
PlayStation 5
GPU as if it were no more capable than the
PS4 GPU or you can use this new intelligence in various ways.
Simple usage could be performance optimizations such as removing back faced or off-screen vertices and triangles.
More complex usage involves something called primitive shaders which allow the game to synthesize geometry on-the-fly as it's being rendered.
It's a brand new capability.