this old news but back in feburary ubisoft's yves guillemot hinted that at the time the game was not up and running on either the PS3 and 360 yet i got the qoute right here
"The team is developing it on high end PC’s and next gen, after that other teams are looking how they can make it fit for the older generation. So the first approach is to see how they can take full advantage of the next gen consoles," and here is the article i got this little piece of information from http://www.gamepur.com/news/10490-development-work-watch-dogs-ps3xbox-360-versions-not-yet-started-says-ubiso.html
pretty much what i am saying is if ubisoft back in feburary had not at the time watch dogs ported to the PS3 and xbox 360 this could mean that ubisoft are simply just rushing the port of the current gen version of watch dogs cause lets face in comparsion with other open world games like sleeping dogs and grand theft auto 5. watch dogs on current looks okay at best