The game's twitter feed also revealed that the E3 demo was running on the PC engine.
The open-world action title, which was unveiled during Ubisoft's E3 press conference, sees players take control of a hacker named Aiden Pearce, who has an entire city's surveillance system at his disposal.
Watch Dogs takes place from the third-person perspective, combining all-out action segments with hacking mechanics.
Pearce can tap into people's electronic devices to gather intel on them, and infiltrate security systems vital to the city.
An E3 demonstration showed the protagonist bringing traffic to a standstill with his computing skills, and gaining entry to an art museum by jamming phones.
It was one of the standout titles from this year's E3 Gaming Expo, attracting universal praise and one of the biggest cheers of the event.
> E3 2012: Day One Round-up
> E3 2012: Day Two Round-up
> E3 2012: Day Three Round-up
View a trailer for Watch Dogs below: