Seems Watch_Dogs was a big success for Ubisoft. They're currently doing quite well financially according to their earning report of the first half of their financial year. They've made €484 million in sales and Watch_Dogs's 9 million copies sold since launch as a very big hand in that.
Back in May Ubisoft revealed that it'd already broken records for first day sales in Europe and this has helped the report to show a 'higher-than-expected' performance. Digital revenue also leapt up 90% more from the previous year, and that brought in €134.7 million worth of sales for them.
They're not estimating that they'll get to close the year with “sales of at least €1,400 million.” This is largely down to the release of a few big titles, Far Cry 4 and Assassin's Creed Unity among them as well as there still being the big selling time of Christmas to look forward to.
An investor call that came with the press release reveals that the hoped for sales figures for the Crew is 2 million copies and Far Cry 4, 6 million