http://www.pcgamer.com/rainbow-six-siege-leaks-site-kicks-off-an-outbreak-arg/

Ubisoft announced earlier this week that the upcoming Rainbow Six Siege year three will feature a new co-op event called Outbreak, headlined by a pair of new "biohazard specialists" who will be added to the operator lineup in the year's first season. That's not going to happen until early next year, though, so to pass some time it looks like Ubi is going to give us an ARG to play with. 

Be aware that potential minor spoilers follow: