https://www.gamespot.com/articles/rainbow-six-sieges-operation-chimera-and-outbreak-/1100-6456869/

Also starting March 6, Ubisoft will now give Rainbow Six Siege's 20 base Operators away for free, along with all past and future weapon attachments. Looking further ahead, the company has revealed a new Siege game mode called Pick & Ban that's coming later this year, reaffirmed its aim to eventually reach 100 Rainbow Six Siege Operators, and stated it does not currently plan on making a sequel.