Ubisoft has announced a "new era" for Rainbow Six Siege, which will apparently begin in March with a showcase devoted to the relaunch-slash-reboot of the game as Rainbow Six Siege X. "The R6 team has been working tirelessly to bring to life the biggest transformation in the game's history," reads Ubisoft's announcement post, "and its purpose is to reinforce Rainbow Six Siege's position at the top of tactical first-person shooters by introducing new ways to play, deepened tactical gameplay, refined game feel and major upgrades all around."..
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Ubisoft announces the 'biggest transformation in Rainbow Six Siege's history' for later this year, so big they're adding an 'X' to the name—But don't call it a sequel
Source: PC Gamer (opens in a new tab)