A glitch that is occurring for some users in Domination in the Call of Duty: Black Ops 4 Beta appears to have revealed that Uplink mode is returning in Call of Duty: Black Ops 4.
At some point in Domination, icons for Uplink ball shows up on the map, as shown:
Uplink was first introduced in Call of Duty: Advanced Warfare and was created around advanced movements. Call of Duty: WWII was the first boots on the ground Call of Duty game to have Uplink, and it was created in an almost ruby-based mode.
There’s no confirmation yet if Uplink is going to be available in Black Ops 4 at launch.