Update:

"It is always unfortunate when internal assets, not intended for public consumption, are leaked. And, while we certainly welcome anticipation for all of our upcoming titles, we're disappointed for our fans, and our development team, that this conceptual asset is now public. The team in our Quebec studio has been hard at work on the particular game in question for the past few years, and we're excited to officially unveil what the studio has been working on at a later date. In the meantime, our number one priority is enhancing the experience of Assassin's Creed Unity for players."

Ubisoft has responded with the following comment:

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2015's Assassin's Creed game has leaked, and it takes place in 19th century London during the Victorian era, Kotaku reports.According to "a person familiar with the game," it's called (either officially or internally) Assassin's Creed Victory , and it's coming to PS4, Xbox One, and PC in fall 2015.We reported in July that Ubisoft Quebec will lead the development of a future Assassin's Creed title. The source indicates that Victory will indeed be created by that studio, and not Ubisoft Montreal as usual.Kotaku also reports seeing seven minutes of "target gameplay footage," which they say was produced in Assassin's Creed's engine, and thus was not pre-rendered.In the video, the assassin climbs a tower to get a view of the city, descends, enters a carriage, and accepts a contract to kill a man. When the carriage is attacked, the assassin battles on top of the moving vehicle. The fight makes its way to a train station where the assassin ascends to the high ground, swings across the station using a grappling hook -- a new item for the series -- and takes out the target.The source also said this will be the lone Assassin's Creed game next fall -- unlike this year which saw the release of both Assassin's Creed Unity and Assassin's Creed Rogue

Brian is an associate editor at IGN. You can follow him @albinoalbert on Twitter