Hate to be the party pooper, but I doubt we'll see much of a change between generations.
Between coronavirus, the added pressures of going multiplatform, and their usual need to add things to the game, I doubt the next gen version will add much over higher frame rates.
If anything is added, I expect it will be ray tracing. Ray tracing really can punch up the wow factor, but if you were expecting a more fundamental graphical change you're going to be disappointed.
I know they've hired more people, but more isn't always better. It takes time and effort to integrate new staff into a company. Probably doubly so under current conditions.
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