now this i find interesting
http://www.gamepur.com/news/10490-development-work-watch-dogs-ps3xbox-360-versions-not-yet-started-says-ubiso.html
http://www.nowgamer.com/news/1823841/wii_u_watch_dogs_already_running_ubisoft.html
so my guess pretty much ubisoft is rushing and not giving the PS3 and 360 versions of watch dogs not much attention and want to focus on the PC/PS4/xboxone/WiiU versions of the game