Year 3, Season 1 of Rainbow Six Siege is just around the corner with Operation Chimera. This season of content will include new operators and the new Outbreak event.
We don't know their names but we did get this little snippet of information along with a teaser of what they look like.
Biological and chemical attacks are growing threats to Operators. Six created the Chemical, Biological, Radiological, Nuclear (CBRN) Threat Unit. CBRN is its own distinct CTU. The following two experts know what they’re doing and they’ll never turn their backs on a hotzone. These two new operators are joining the multiplayer roster and will also be playable in the limited time Outbreak event, along with other legacy operators.
No in depth details about their abilities have been released as of yet except for the French Operator uses a drone to "maintain quarantine perimeters" and the Russian Operator uses "self dissolving nano bots" that allies can benefit from.
Some more info about the Outbreak event has been released as well
Suit up and check your gear because Rainbow Six is tackling an epidemic consuming the town of Truth or Consequences, New Mexico. Choose your best team of three to neutralize the threat. If you don’t choose your Operator in time on the Operator Selection screen, your man Recruit will still have your back. As always, he’s ready to serve.\