I may not be exactly answer the right question, but you made me wonder, how long is the wait to get X3D parts?
5800X Nov 2020
5800X3D Apr 2022 (+5 months)
7_00X Sep 2022
79_0X3D Feb 2023 (+5 months)
7800X3D Apr 2023 (+7 months)
So maybe expect 5+ months wait from Zen 5 release for the X3D parts. Of course, they could do something different so don't rely on this.
I think they're very much on the path to adding L3 cache. I wouldn't expect them to look at L4 unless they significantly improve Infinity Fabric.