Rainbow Six Wiki

"Sharpen your eyes with Operation Phantom Sight! Become invisible to cameras and drones and move quietly with Nøkk and her Hel gadget. Watch your enemies through smokes and be immune to flashes with Warden and his Glance Smart Glasses. Rediscover Kafe as you have never seen it with the rework of the map."
Official Website Description

Operation Phantom Sight is the thirteenth free expansion for Tom Clancy's Rainbow Six Siege. It adds two new Operators from the American Secret Service and the Danish  Jægerkorpset. It will also feature a rework of the map Kafe Dostoyevsky. [1]

It was officially announced on February 17, 2019 and was released on June 11, 2019. As with all other Seasons, owners of the Season Pass will receive the Operators a week early.