Call of Duty is still up in the air, but “back-end work” is going on for Activision Blizzard’s other titles, according to Microsoft’s Phil Spencer.

With Diablo 4 becoming the first Activision Blizzard game to launch for Game Pass on March 28th, the door is seemingly open for other titles to follow. Speaking to Game File’s Stephen Totilo, Microsoft Gaming CEO Phil Spencer said the company intends that “the full portfolio of games from ZeniMax, Activision Blizzard and XGS – Xbox Game Studios – will be on Game Pass, day one.”

However, that doesn’t mean Call of Duty is coming to the service immediately. Spencer also stated that “back-end work” is happening to bring Activision Blizzard titles to “PC and console simultaneously.”

This year’s Call of Duty is rumored to be Call of Duty: Black Ops Gulf War and reportedly features a fully open-world campaign. However, it hasn’t been officially announced. During a reported virtual town hall meeting, Spencer allegedly said it was safe to assume it would launch in October, perhaps indicating that he wasn’t 100 percent sure.

We’ll likely find out in the coming months, but whether it’s the next instalment or previous titles, the wait for Call of Duty on Game Pass continues.