Rainbow Six Quarantine is the PvE co-op spin-off from Rainbow Six Siege and while many expected it to be at least a year away, it might turn up in half that time, according to the latest Ubisoft financial call and their CEO, Yves Guillemot.
Rainbow Six Siege Quarantine is based on the successful limited-time mode in Rainbow Six Siege, Outbreak. It is akin to Left 4 Dead series in its feeling but it's rooted in Rainbow Six Siege mechanics and players are fighting space zombies that have many variations.
Quarantine is not officially confirmed to be exactly that but the teaser trailer above left little to doubt since the infection spread in a way similar to that in Outbreak. Furthermore, Ela states that the person is going into stasis which is one part of the process of turning into a space zombie.
Yves Guillemot all but confirmed that it would be the same setting as he spoke about Quarantine in a financial call, stating the game would be released by the end of the fiscal year. Ubisoft's current fiscal year ends on 31 March 2019, which means Rainbow Six Siege Quarantine is planned for release before that.
This leaves us with slightly more than half a year's worth of waiting but an exact release date is still up in the air. While a narrower release window could be a bit more appealing, it's still nice to know Quarantine is coming in less than a year.
Back to the topic of Guillemot confirming that Quarantine would be more of Outbreak, he stated that he expects the game to be successful since it features "the proven gameplay of Rainbow Six Siege Outbreak".
It is currently unknown what the full roster will look like in Rainbow Six Quarantine or whether it would feature all of Rainbow Six Siege's operators. Only Ela and Vigil have been confirmed so far, through the teaser trailer above.