https://www.gamespot.com/articles/rainbow-six-siege-to-receive-ps4-pro-xbox-one-x-up/1100-6456362/

Ubisoft says it plans to add PS4 Pro and Xbox One X support to Rainbow Six Siege--it just doesn't know when. Responding to a fan on Twitter, the company said support for the two upgraded consoles "is definitely on our road map" for future updates, but that it does "not have an ETA."