The title's deletion suggests Patriots, which was first announced in November 2011, may have been cancelled by Ubisoft. While some retailers will automatically deactivate database entries after a long period of time, according to IGN a source close to GameStop claims the retail company "actively flipped a switch" to eliminate the title from their system.
According to the source, GameStop rarely deletes titles from major publishers without official confirmation that the game has been cancelled.
Commenting on the matter, a Ubisoft spokesperson said: "We have nothing further to share about Rainbow 6: Patriots at this time."
Last November, Ubisoft chairman and CEO Yves Guillemot told Polygon the title is still in development and may even release on next-gen consoles.
"The only thing I can say is that we have a good team working on it, and it's really looking good," Guillemot said. "So when it will come, it will surprise the industry."