The new update 2.1.1 for Rainbow Six Siege has been released. The update brings many improvements and corrections as well as the Alpha Packs, which are loot boxes offering free cosmetics like Black Ice skins or exclusive legendary tier items.
As for the modifications, Hibana's X-KAIROS has been completely recoded and the spawning issue on Kanal where the defenders could kill the members of the attacking team as soon as they appeared has been fixed.
You can read all of the changes in the official patch notes.