This lines up with comments from Ubisoft CEO Yves Guillemot, who said last year during a financial call that Watch Dogs would be out sometime in 2013.
The poster for Watch Dogs features quotes stating the game will be a "truly next-gen adventure," though it does not specify any consoles. Next-generation consoles from Microsoft and Sony are believed to be on store shelves for this holiday season. Sony may even announce the PlayStation 4 next week.
The poster also features the words "Power Up Rewards," suggesting the material leaked out of GameStop.
Watch Dogs was announced during Ubisoft's 2012 Electronic Entertainment Expo media briefing last June with no official word on platforms or a release date. It is an all-new intellectual property in development at Ubisoft Montreal that focuses on hacking.
Representatives from Ubisoft and GameStop were not immediately available to comment.