The info comes from an artist's portfolio, which features a designed ad for Gotham Knights with a "Spring 2022" release window.
A new leak suggests that Gotham Knights is/was scheduled to release sometime during Spring 2022. At this moment, it is hard to say if the leaked release window is the internal, actual release date for the game or a date that WB Games Montreal were targeting before the delay.
We think it's the latter since Warner Bros. would probably reveal this release window at the DC Fandom event a couple of weeks ago. Of course, this is just our guess so take it as speculation and nothing more.
The art for the game has been shared by WB Games Art Director Jin Park but since players discovered it, the page containing the art has been taken down, which is quite interesting and could suggest that the release date is pretty much real.
Until officially announced, take this with a grain of salt. Gotham Knights was initially scheduled to release sometime in 2021 but WB Games decided to delay it to 2022. The publisher did not reveal a specific release date though, they only mentioned 2022 as the target release window, which means we could get the game even in late 2022.
Gotham Knights is set to launch on PC, PlayStation 4, PlayStation 5, Xbox One and Xbox Series X|S.