The VV crew, which was absorbed by Blizzard still manages and updates the game.
“On January 22, 2021, Vicarious Visions was moved by Activision Blizzard from a subsidiary of Activision to a subsidiary of Blizzard Entertainment. Going forward, the more than 200 employees of Vicarious Visions will be employees of Blizzard. Vicarious had been working with Blizzard for about two years prior to this announcement, and specifically on the planned remaster of Diablo II, Diablo II: Resurrected, and Blizzard felt the move would be best as to have Vicarious’ group provide continued support not only on the remaster but also on other Diablo properties including Diablo IV.”