Rod Fergusson, the general manager of Diablo at Blizzard Entertainment, confirmed on Twitter that the company's upcoming game, Diablo IV, is not currently planned to be included in the Xbox Game Pass / PC Game Pass lineup. Therefore, players will still need to purchase the game with their own money.
By the way, Diablo IV will soon provide Early Access from March 17 to March 19 to players who pre-ordered the game, followed by an open beta from March 24 to March 26. This beta will provide players the chance to experience the game's prologue and the first chapter, as well as the freedom to explore the Fractured Peaks region, slay various demons, complete interesting tasks, and collect powerful loot. However, it is important to note that players could only reach the maximum character level of Lv 25 during the beta period.