Rainbow Six Siege game designer Andrew Witts elaborates on why Chavez will not return for Ubisoft's latest instalment: "It's a very complicated thing with the Clancy-verse and the books and things. For Siege, we wanted to have our own universe and not have to make a sequel or anything like that. Siege is its own universe with its own new terrorist faction, and new operators."

Instead, Ubisoft is focusing on creating its own new playable operators who will each have distinct personalities inspired by their unique gadgets they bring to the field, such as shock drones, sledgehammers and breaching charges.

For more, check out GameSpot's liveblog of Ubisoft's E3 press conference. Rainbow Six Siege will also have a beta arriving later in the year before its release on Xbox One, PS4, and PC in the holiday period.