Ubisoft has had quite the amount of teaser 'leaks' for quite a few of their franchise as of late, with Assassin's Creed reportedly starring Vikings and now an alleged confirmation that Watch Dogs 3 features a London setting.
Back in early February, we reported on a shaky rumor that said that both a new Assassin's Creed game would arrive in 2019 and feature Vikings and the new Watch Dogs 3 would arrive alongside it. The rumor suggested that the Watch Dogs 3 game would be set in London and now Kotaku's Jason Schreier says he can confirm that this news, and the Assassin's Creed news is true.
The new Assassin's Creed game is expected to launch sometime during 2020, and Watch Dogs 3 is expected to launch by the end of the year. It is very possible that Ubisoft are holding off on both of these official announcements until E3 2019, which is why Kotaku said that Ubisoft declined to comment on both of these rumors. As always these types of 'leaks' and 'rumors', the news is not 100% confirmed until an announcement is made by Ubisoft, so I guess we will wait and see what happens.