Better Stealth
As it stands, Watch Dogs was a pretty good stealth game. But similar to other issues with it, all of the guns and explosions really got in the way of what could have been a genius stealth system. With a few tweaks, Watch Dogs 2 could be a game that you never even have to ever break stealth to complete.
The best stealth games make the player feel in control of the situation while rewarding inventive and precise play. The first game did this job excellently with the wealth of cameras that were instantly accessible and kept the player in the know of enemy locations and objectives. Watch Dogs 2 simply needs to take this ideal of stealth further (and copy MGSV in every way possible). Allow for the dragging and hiding of bodies, let us lift helpful information off of guards through their phones (or maybe more direct means), or even cut off their communication lines so that they can’t call in reinforcements. Just give the player myriad options that needn’t result in a fight.