Lenovo announced that the Legion 5 Pro will be updated in 2021 with Ryzen 5000 silicon, RTX 30-series graphics and a 16:10 display. A Google-cached product specs reference let slip by the company ahead of its March release seems to confirm this, as well as how much RAM and storage space the machine can support.
https://www.notebookcheck.net/Lenovo-posts-a-specs-ref-for-the-new-Legion-5-Pro-ahead-of-its-release.518331.0.html