Huawei is rumored to provide a successor to the Mate X2 premium foldable phablet in 2022, even if it can't support 5G. Now, a device with its alleged model number has reportedly been approved for sale by the regulator 3C. Therefore, the X3 might see a launch event soon.
https://www.notebookcheck.net/Huawei-s-2022-flagship-foldable-smartphone-moves-in-on-a-launch-with-a-new-certification.611275.0.html