The successor to the Mate Xs has reared its head again, this time at the TENAA. Two models have been certified with the TENAA, both with dual-SIM connectivity and 66 W fast-charging. The Mate X2 has been listed as a 5G device too, suggesting that it will have Huawei's Kirin 9000 chipset.
https://www.notebookcheck.net/The-Huawei-Mate-X2-visits-the-TENAA-Kirin-9000-chipset-likely-in-line-for-5G-foldable-smartphone.505720.0.html