Currently, the new controllers are not officially supported in iOS or iPadOS, but Apple says “Microsoft and Apple are working together to bring compatibility for the Xbox Series X controller to customers in a future update.”
This isn’t the first time the two companies have had to work on improving Xbox controller support. Apple worked with Microsoft to add support for the Xbox Elite 2 controller and the Xbox Adaptive Controller to iOS 14 earlier this year. The support debuted nearly a year after the Elite 2’s release, though.
While Apple is unclear on when support may be added, it could come as part of the iOS and iPadOS 14.3 update which is currently in beta. Already, that beta includes support for the PS5 controller and Apple could easily add the Xbox Series X controller to the list.