Although Ubisoft dropped a new update today, for the Xbox one and Playstation 4. The multiplayer is still not working. The co-op and normal story modes run fine, but no multiplayer. They haven’t released when it will be out or up and running, but they have said that the patch for multiplayer is in certification with Microsoft as well as Sony. Hopefully it will be released soon, seeing as the game dropped today, technically unfinished.
Here is the official Ubisoft statement on the matter!
During the pre-launch phase of Watch Dogs 2, we were disappointed to discover an issue tied to the seamless multiplayer feature that caused the game to lag and crash periodically. In order to eliminate that issue at launch and for players to enjoy a smooth game play experience, we have decided to wait to launch the seamless multiplayer feature so it would not impact the core gameplay experience.
To be clear, players can fully enjoy the entire single-player experience without any concerns. Additionally, co-op is still fully functional by inviting friends through the game menu. However, the Bounty-Hunter mode and other activities that would occur with other outside players who enter your game will be unavailable until the issue is resolved. We truly appreciate the patience of our player community.