Console revisions are common in the industry and these revisions use to include chip revisions. The last generation, Sony and Microsoft include new chips revisions to launch PS4 Pro and Xbox One X, but this gen evaluating the shortage of components there are less chances to see new powerful revision of Series X and PS5, but who knows.
Brad Sams has revealed that Microsoft is working on a new chip for Xbox Series X. He commented the following about this matter:
“Now, are we going to see performance improvements, are we going to see anything else? I do not believe so but Microsoft is always working on making cooler, more efficient chips because that lowers the cost of production.”
In the near future, Microsoft could have plans to improve the efficiency (and gain a reduction of the chip cost with the movement) of the current chip mounted for Xbox Series X.
We will see.