According to a post today on NeoGaf, Watch_Dogs will be available on May 27th. The game had previously been set to release last year in time for the new consoles. For reasons unknown the game was pushed to Q2 2014. Ubisoft has recently confirmed the game’s release date to be 5/27/2014
Below is the video that was leaked giving an overview of the story and announcing the date before official confirmation.
Link to the original post on NeoGaf http://www.neogaf.com/forum/showthread.php?t=780092
Watch_Dogs is rated “M” and will be released on 5/27/2014 for the Xbox 360, PS3, PC, Xbox One, and PS4