That doesn't look to be stopping anytime soon either. During an investor call (via Eurogamer), Ubisoft CEO Yves Guillemot announced that Assassin's Creed Unity and Assassin's Creed Rogue shipped 10 million units combined already. Compare that to the 11 million announced in May last year for the prior title, Assassin's Creed: Black Flag. Unity and Rogue will surely far surpass that number when May comes a knocking.
Keep in mind that this is shipped to stores, not sold to consumers.
Guillemont also addressed Untiy's famous technical problems and how it will inform future titles:
In the case of Unity, we had to redo 100 per cent of the engine. So when you do that, it's painful for all the group and everything has to be recalibrated. With this game, a few things were not perfect when the game was launched, but the engine has been created, and it's going to help the brands to shine in the future.
Next fiscal year we will launch a new Assassin's Creed game based on the same technology that powered Unity. We are very confident that the experiences learned, along with the customer feedback, will help us take Assassin's Creed to the next level of quality and innovation.
We know that that game will be Assassin's Creed: Victory, which will be set in my backyard, London during the Victorian era. I really do hope they take the failings of Unity to heart too. It might be tricky to get people coming back after two dodgy releases.