The following info comes from Watch_Dogs Animation Director Colin Graham...

- stealth is a player choice
- you combine stealth movement and cover with hacking to make distractions
- some areas of contextual stealth
- dedicated cover button with sticky cover
- “variety” of different hideouts
- Aiden will be able to swim or to take a boat
- there will be plenty of boats to hop aboard
- “cars on demand” system that will allow Aiden to request a vehicle to be delivered to his location
- this works with cars and bikes only
- the team didn’t deem necessary to implement this feature with boats