- Free roaming online spans the entire map
- leave your free roam session open to whoever you want to enter, or invite only friends
- to enter free roam you open the map, switch to the grid and send the request
- after leaving an area and then entering it again its statistically possible to meet the same NPC again, but very unlikely
- go to sleep in a hideout to change the time of day, but you cannot select the weather
- when using quick reflexes ability in multiplayer, you still get the helpers (visual cues), but time doesnt slow down
Source:
http://www.dualshockers.com/2014/04/28/watch_dogs-director-talks-difference-between-ps4-and-pc-free-roaming-weather-and-more/Kinda sounds like GTA V in a way though my only experience is watching online play sessions on youtube.