At the earliest.
Yesterday, it was decided by the American court that there are no obstacles for Microsoft to buy Activision Blizzard, and shortly afterwards the British CMA announced that they will try to find a solution to their cloud concern instead of trying to prevent Microsoft’s appeal in court.
There are many indications that Microsoft will take over Activision Blizzard in the near future, which raises the question of when we can start seeing the giant publisher’s games for Game Pass.