https://www.gamespot.com/articles/rainbow-six-siege-update-out-now-full-12-patch-not/1100-6458613/

A new update for Rainbow Six Siege is set to launch on all platforms--PC, PS4, and Xbox One--on Tuesday, May 1, Ubisoft has announced. Rather than introduce new features, it deals primarily with balance changes, including the much-anticipated nerf to Lion, the Operator who has been widely considered overpowered since the launch of Year 3. [Update: The patch is now available on all platforms.]

"For example, on Lion, they did spot that the full outline detection was problematic. We did not have time to modify that system before the release of the Operator. This shows that we have room for improvement in our iteration pipeline. We are working on ways to improve the feedback to iteration loop for Operators pre-release."