Ubisoft is releasing an update for Watch Dogs: Legion that will have you and up to three teammates working to reach an extraction point while trying to take down zombies. In Watch Dogs: Legion of the Dead, you can take down zombies not just with a headshot but with gadgets and hacked objects like cars and weaponized drones. It's possible to revive teammates when they get knocked down by zombies. You will also need to collect supply packages as you make your way through London. This mode is currently only available for the PC, and it's currently in alpha so expect to run into some bugs and big changes to happen.
Source: Engadget