One Angry Gamer "It's completely likely that development for Rainbow Six: Siege will be “completed” ahead of the game Due Process. It's also completely likely that Rainbow Six: Siege will actually have a solidified release date when the time comes for it to be “completed”, as opposed to Due Process where it's likely to be finished when it's finished (whenever that might be). However, in the interim, Siege is just a demo. What's more, it's a demo that we don't actually know much about other than that it's a vertical slice of something Ubisoft hopes to achieve. On the opposite end of the spectrum we have Due Process. It's not a demo; it's not a vertical slice; it's in alpha and it's very playable."