UPDATE 19th October 2020: Microsoft has confirmed Rainbow Six Siege is coming to console with Xbox Game Pass and cloud gaming on Android devices with Xbox Game Pass Ultimate on 22nd October.

ORIGINAL STORY 18th October 2020: A cryptic tweet shared by the official Xbox Game Pass Twitter account over the weekend looks to be teasing that Rainbow Six Siege might be the next big game coming to Xbox Game Pass.

While this is merely speculation at this point, the mysterious tweet - which you can see below - has no text but features a single image with six rainbows and what appears to be a castle under siege... which doesn't leave a lot of other options, let's face it.

pic.twitter.com/oJOf33vdSd

— Xbox Game Pass (@XboxGamePass) October 17, 2020

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The account has yet to respond to commenters guessing what the image might pertain to, but the guesses are overwhelmingly in agreement that it is likely a reference to Ubisoft's fan-favourite shooter series (thanks, VG24/7).

Just in case you missed it, Rainbow Six Siege has a free next-gen console upgrade, Ubisoft has announced. It means existing players of Ubisoft's hugely popular competitive FPS will be able to get the PlayStation 5 and Xbox Series X and S version at no extra cost when upgrading within the same family of consoles.

The next-gen versions run at up to 120 frames per second and 4K resolution, Ubisoft added.

Rainbow Six Siege is great in single player (1080p60 scenario PC gameplay) Watch on YouTube