Kotaku and G4 have received some leaked marketing material which include some detailed information about the game's platforms.
Instead of the standard "available for Xbox 360 and Playstation 3"
line, the poster says that the game will be "available on all home consoles". This could mean that the Ubisoft game will release on next-gen consoles. While Ubisoft announced that Watch_Dogs will be available for PS3, Xbox 360 and PC as well.
G4 also states that
Watch Dogs is a "truly next-gen adventure", according to a piece of marketing feature.