https://www.gamespot.com/articles/rainbow-six-siege-outbreak-update-teased-in-new-vi/1100-6456688/

The launch of the special new Outbreak co-op event in Rainbow Six Siege is drawing near, and Ubisoft is continuing to tease new details about what to expect. We've now gotten a new CG trailer that sets up some of the backstory of what's going on in the new mode, which is dramatically unlike anything that's been offered in Siege previously.