As we wrote in our Watch Dogs 2 review, Ubisoft decided to remove the seamless multiplayer due to an error that caused the game to lag and crash periodically when interacting with other players. When they removed it we were told that it would probably be fixed by launch. Unfortunately, it won't.
They've posted a message on the game's official forum stating that the problems have yet to be fixed, but that it's their top priority. Hopefully this means that we'll get it sooner rather than later. Still, we found the game to be well worth a purchase even without that aspect of the game, so you'll probably have a lot of fun while waiting for the fix. What are your thoughts on the game?