In a recent video interview, Watch_Dogs Senior Producer Dominic Guay discussed a connectivity feature for the game. Guay said that “one of the core pillars is connectivity.” In addition Guay mentions some sort of cell phone application for Watch_Dogs saying:
“We wanted the player to be able to connect to Watch_Dogs even through his mobile. Be able to play directly with people who are on their console, who are on their PlayStation 4, even if he’s on the bus. Basically to be attached to our game world even when he steps out of the living room.”
This quote obviously mentions the PS4 by name, so this could be a PS4 only feature, or perhaps it will be used for other platforms as well, that remains to be seen. Here’s the full video: