During a developer session at Eurogamer Expo Ubisoft Montreal Creative Director Jonathan Morin explained a juicy detail about the upcoming open world games Watch_Dogs.
Morin explained that the game was initially codenamed "Nexus," and it even had a logo, that you can see above. That logo, that symbolized a hacked system, hasn't completely disappeared from the game even if the title is now different. As you can see below it ended up on Aiden's mask.
Morin mentioned that a lot of little details from the initial production of the game, started five years ago, are scattered around in the game.