Rainbow Six Quarantine Release Date Update Shared by Ubisoft Rainbow Six Rainbow Six Siege. Speaking to investors during an earnings call, Ubisoft confirmed that Rainbow Six Quarantine will be out before September 30, 2021. When exactly before the end of September, Ubisoft doesn't say, but this is the second time it has reaffirmed this specific window. Ubisoft also doesn't disclose when we will hear more about the game, see more of the game, or get an actual release date. That said, you'd expect this to happen at E3 next month, where Ubisoft will have to show off the game if it's actually releasing this year.